Optical ferrules

ABSTRACT

An optical ferrule adapted to receive and transmit light is described. The optical ferrule includes first and second alignment features for mating with corresponding alignment features of a mating optical ferrule. One of the first and second alignment features may be compressible or expandable.

BACKGROUND

Alignment of electrical or optical components can be achieved by using pin and sleeve connectors, for example. The accuracy of the alignment of the two components is typically limited to the accumulated tolerances of all the alignment features on both components. Tight tolerances are typically required in conventional connectors in order to achieve satisfactory alignment accuracy.

Optical connectors can include optical ferrules that include elements for receiving and securing optical waveguides, elements for affecting light from the optical waveguides, and features for aligning the optical ferrule to a mating ferrule.

SUMMARY

In some aspects of the present description, an optical ferrule including a body; a first flexible arm having a first fixed end attached to a first side of the body and an opposite first free end; and a second flexible arm, opposite the first flexible arm, having a second fixed end attached to a second side of the body, opposite the first side, and an opposite second free end is provided. The body includes an optically transparent portion for propagating an optical signal therein. When the optical ferrule is mated with a mating ferrule, the first and second flexible arms are flexed away from the respective first and second sides of the body, and the first and second free ends contact the mating ferrule.

In some aspects of the present an optical connector including a housing; one or more alignment features attached to the housing for engaging a corresponding one or more alignment features attached to a housing of a mating connector; and a unitary optical ferrule at least partially disposed within the housing is provided. The unitary optical ferrule includes an optical waveguide alignment member for receiving, aligning and permanently attaching to a plurality of optical waveguides; a light redirecting member for changing a direction of light propagating within the optical ferrule; and first and second flexible alignment features on opposite sides of the optical ferrule, such that when the connector mates with a mating connector including a mating optical ferrule, the first and second flexible alignment features flex away from one another and engage the mating optical ferrule at respective first and second contact points.

In some aspects of the present description, an optical ferrule including a body and opposing arms on opposite sides of, and spaced apart from, the body is provided. Each arm has a fixed end attached to the body and an opposite free end. When the optical ferrule is mated with a mating ferrule, at least one of the arms is flexed away from the body, and both free ends contact the mating ferrule.

In some aspects of the present description, an optical ferrule including a body and a first flexible arm is provided. The first flexible arm has a first fixed end attached to the body and an opposite first free end adjacent to and spaced apart from the body. When the optical ferrule is mated with a mating ferrule, the first flexible arm is flexed away from the body, and the first free end contacts the mating ferrule. The optical ferrule is adapted to receive and transmit light.

In some aspects of the present description, an optical connector adapted to mate with a mating connector along a mating direction in a mating plane is provided. The optical connector has at least one flexing element such that when the optical connector is mated with the mating connector, the at least one flexing element is flexed and makes contact with the mating connector, and the optical connector and the mating connector are adapted to slide relative to each other in the mating plane.

In some aspects of the present description, an alignment frame for facilitating a mating of a first ferrule to a second ferrule along a mating direction is provided. The alignment frame includes a base; opposing first and second arms extending forwardly from opposing ends of the base; spaced apart first and second flexible features disposed on an inner surface of the first arm and facing the second arm; and spaced apart third and fourth flexible features disposed on an inner surface of the second arm and facing the first arm. When the alignment frame facilitates a mating of a first ferrule to a second ferrule resulting in the first ferrule being mated to the second ferrule, the opposing first and third flexible features are flexed and in contact with the first ferrule, and the opposing second and fourth flexible features are flexed and in contact with the second ferrule.

In some aspects of the present description, an optical ferrule including first and second alignment features for mating with corresponding alignment features of a mating optical ferrule is provided. One of the first and second alignment features is compressible or expandable and the optical ferrule is adapted to receive and transmit light.

In some aspects of the present description, an optical ferrule including a first feature having a size and a shape, and a second feature defining an expandable opening is provided. The expandable opening has an unexpanded state and an expanded state, such that inserting an object having the size and the shape of the first feature into the expandable opening expands the opening from the unexpanded state to the expanded state. The optical ferrule is adapted to receive and transmit light.

In some aspects of the present description, an optical ferrule including a first feature defining an opening, and a compressible second feature is provided. The opening has a size and a shape and the compressible second feature has an uncompressed state and a compressed state. Inserting the compressible second feature into an opening of an object, the opening of the object having the size and shape of the opening of the first feature, compresses the second feature from the uncompressed state to the compressed state. The optical ferrule is adapted to receive and transmit light.

In some aspects of the present description, an optical ferrule adapted to receive and transmit light and adapted to mate with a mating optical ferrule along a ferrule mating direction is provided. The optical ferrule includes a first alignment feature for engaging a corresponding first alignment feature of a mating optical ferrule, and a second alignment feature for engaging a corresponding second alignment feature of the mating optical ferrule. The first alignment feature is located at a first location along the ferrule mating direction, and the second alignment feature is located at a substantially different second location along the ferrule mating direction. When the optical ferrule is mated with the mating optical ferrule along the ferrule mating direction, the first and second alignment features substantially simultaneously engage the corresponding first and second alignment features of the mating optical ferrule.

In some aspects of the present description, an optical ferrule adapted to mate with a mating optical ferrule along a length direction of the optical ferrule is provided. The optical ferrule has a thickness along a thickness direction of the optical ferrule; a first alignment feature for contacting a corresponding first alignment feature of a mating optical ferrule at a first contact region of the first alignment feature; and a second alignment feature for contacting a corresponding second alignment feature of the mating optical ferrule at a second contact region of the second alignment feature. The first and second contact regions are offset relative to one another along at least the length and thickness directions of the optical ferrule.

In some aspects of the present description, an optical ferrule including first and second alignment features for engaging corresponding alignment features of a mating optical ferrule is provided. The optical ferrule is adapted to mate with the mating optical ferrule along each of two orthogonal dimensions of the optical ferrule.

In some aspects of the present description, an optical ferrule including first and second alignment features for engaging corresponding alignment features of a mating optical ferrule is provided. When the optical ferrule is mated with the mating optical ferrule, the optical ferrule is adapted to unmate from the mating optical ferrule via movement of the optical ferrule relative to the mating optical ferrule along a first dimension of the optical ferrule; and when the optical ferrule is mated with the mating ferrule, the optical ferrule is adapted to unmate from the mating ferrule via movement of the optical ferrule relative to the mating ferrule along a second dimension of the optical ferrule orthogonal to the first dimension.

In some aspects of the present description, an optical ferrule including a first alignment feature having a size and a shape; and a second alignment feature defining an opening is provided. The second alignment feature includes a first compliant feature having a first state and a second state different from the first state. Inserting an object having the size and the shape of the first alignment feature into the opening changes the first compliant feature from the first state to the second state. The optical ferrule is adapted to receive and transmit light.

In some aspects of the present description, an optical ferrule including a first alignment feature defining an opening, and a second alignment feature is provided. The opening has a size and a shape, and the first compliant feature has a first state and a second state different from the first state. Inserting the second alignment feature into an opening of an object, the opening of the object having the size and shape of the opening of the first alignment feature, changes the first compliant feature from the first state to the second state. The optical ferrule is adapted to receive and transmit light.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a schematic plan view of a ferrule;

FIG. 1B is a schematic plan view of a ferrule assembly including two mated ferrules;

FIG. 1C is a schematic side view of the ferrule assembly of FIG. 1B;

FIG. 1D is a schematic plan view of a ferrule;

FIG. 2A is a schematic plan view of a connector;

FIG. 2B is a schematic side view of the connector of FIG. 2A;

FIG. 2C is a schematic plan view of a connector;

FIG. 3A is a schematic plan view of two mated connectors;

FIG. 3B is a schematic side view of the mated connectors of FIG. 3A;

FIG. 3C is a schematic plan view of two mated connectors;

FIG. 4A is a top view of a ferrule;

FIG. 4B is a front perspective view of the ferrule of FIG. 4A;

FIG. 5A is a perspective view of a ferrule assembly including two mated ferrules;

FIG. 5B is a top view of the ferrule assembly of FIG. 5A;

FIG. 5C is a bottom view of the ferrule assembly of FIG. 5A;

FIG. 5D is a back view of the ferrule assembly of FIG. 5A;

FIG. 5E is a front view of the ferrule assembly of FIG. 5A;

FIGS. 6A-6C are schematic top views of an alignment frame;

FIG. 7A is a perspective view of an alignment frame configured to facilitate the mating of first and second ferrules;

FIG. 7B is a top view of an alignment frame configured to facilitate the mating of first and second ferrules;

FIG. 7C is a top view of an alignment frame and mated first and second ferrules;

FIG. 8A is a perspective view of an alignment frame;

FIG. 8B is a perspective view of a portion of the alignment frame of FIG. 8A engaged with a first ferrule;

FIG. 8C is a perspective view of the alignment frame of FIG. 8A engaged with a first ferrule and disposed to facilitate a mating of the first ferrule to a second ferrule;

FIGS. 9A-9B are schematic plan views of a ferrule;

FIG. 10 is a top perspective view of a ferrule assembly including two mated ferrules;

FIG. 11A is a top perspective view of a ferrule assembly including two mated ferrules;

FIG. 11B is a bottom perspective view of the ferrule assembly of FIG. 11A;

FIG. 12A is a schematic plan view of a ferrule;

FIG. 12B is a schematic side view of the ferrule of FIG. 12A;

FIG. 13A is a schematic plan view of a ferrule;

FIG. 13B is a schematic side view of the ferrule of FIG. 13A;

FIG. 14 is a schematic top view of a ferrule assembly;

FIGS. 15A-15B are schematic plan views of a ferrule;

FIG. 15C is a schematic side view of the ferrule of FIGS. 15A-15B;

FIG. 16 is a perspective view of first and second ferrules;

FIG. 17A is a perspective view of a ferrule assembly including two mated ferrules;

FIGS. 17B-17C are perspective views of two unmated ferrules;

FIG. 18A is a top perspective view of a ferrule;

FIG. 18B is a bottom perspective view of the ferrule of FIG. 18A;

FIGS. 18C-18D are perspective views of two proximate ferrules;

FIGS. 19-22 are schematic top views of ferrules;

FIG. 23 is a schematic top view of a ferrule assembly including two mated ferrules;

FIG. 24A is a perspective view of an optical ferrule; and

FIG. 24B is a perspective view of two proximate optical ferrules.

DETAILED DESCRIPTION

In the following description, reference is made to the accompanying drawings that forms a part hereof and in which are shown by way of illustration. The drawings are not necessarily to scale. It is to be understood that other embodiments are contemplated and may be made without departing from the scope or spirit of the present disclosure. The following detailed description, therefore, is not to be taken in a limiting sense.

Spatially related terms, including but not limited to, “lower,” “upper,” “beneath,” “below,” “above,” and “on top,” if used herein, are utilized for ease of description to describe spatial relationships of an element(s) to another. Such spatially related terms encompass different orientations of the device in use or operation in addition to the particular orientations depicted in the figures and described herein. For example, if an object depicted in the figures is turned over or flipped over, portions previously described as below or beneath other elements would then be above those other elements.

In some embodiments of the present description, connectors or connector components such as ferrules or alignment frames allow for accurate alignment by utilizing compliant features. In some embodiments, these compliant features allow greater tolerances for manufacturing variations, such as shrinkage of an injection molded polymer ferrule. For example, a ferrule may include one or more flexible arms that guide or help guide the ferrule and a mating ferrule into alignment when the two ferrules are mated. In some embodiments, first and second arms may have the same flexing properties (e.g., the same modulus and the same geometry). In some cases, symmetric flexing properties may be reliably obtained by utilizing an injection molding process, for example, to form a unitary ferrule. A unitary ferrule is a single piece structure (as opposed to a ferrule that includes pieces formed separately and adhered or otherwise fastened together). The ferrule be made from any suitable materials including polymers or ceramics.

In some embodiments, the ferrule may have a geometric design that allows accurate alignment even when the first and second flexible arms have different flexing properties. Accurate alignment can be obtained if the first flexible arm is more flexible than the second flexible arm, for example, because the ferrule and a mating ferrule may be mated to form a ferrule assembly with the first flexible arms of each ferrule on a same first side of the ferrule assembly and the second flexible arms of each ferrule on an opposite second side of the ferrule assembly. As described further elsewhere herein, such arrangements allow for balanced forces on the ferrules when correctly aligned even if the first and second flexible arms have differing flexing properties. The ferrules, alignment frames and connectors described herein may allow for improved alignment accuracy and/or may allow accurate alignment without the tight mechanical tolerance requirements of conventional connectors.

The ferrules described herein may be hermaphroditic ferrules and may be unitary ferrules. The ferrules described herein may be optical, electrical, or hybrid ferrules having features for both optical and electrical connections. An optical ferrule may be described as a hybrid ferrule if the optical ferrule is adapted to transmit and/or receive light and is further adapted to receive and/or transmit an electrical signal. A hybrid ferrule may be both an electrical ferrule and an optical ferrule and may be adapted to provide both electrical and optical signals to a mating ferrule. In some cases, a hybrid ferrule may include an optoelectronic transducer and may be adapted to receive an optical signal and transmit an electrical signal or receive an electrical signal and transmit an optical signal. The connectors described herein may be optical, electrical, or hybrid connectors and may include one or more ferrules and may include one or more alignment frames.

FIG. 1A is a schematic plan view of first ferrule 100 a including a body 110 a having a width W, a first flexible arm 120 a and a second flexible arm 130 a opposite the first flexible arm 120 a. Body 110 a includes a first side 117 a and a second side 119 a opposite the first side 117 a. First flexible arm 120 a has a first fixed end 122 a attached to the first side 117 a and an opposite first free end 124 a. Second flexible arm 130 a has a second fixed end 132 a attached to the second side 119 a and an opposite second free end 134 a.

In some embodiments, the first and second flexible arms 120 a and 130 a are symmetrically disposed on the first and second sides 117 a and 119 a of the body 110 a. In some embodiments, the first and second flexible arms 120 a and 130 a have the same flexing properties. In other embodiments, the first and second flexible arms 120 a and 130 a may have different flexing properties. For example, one or the other of the first and second flexible arms may be more rigid by being formed of a higher modulus material or by being thicker, for example. This can be either intentional or accidental, e.g. via a molding process or material non-uniformity. In some embodiments, one of the first and second flexible arms is more flexible than the other one of the first and second flexible arms. In some embodiments, one, but not the other one, of the first and second flexible arms is substantially rigid.

An x-y-z-coordinate system is illustrated in FIG. 1A. The first and second flexible arms 120 a and 130 a extend in the z-direction, which is a mating direction of the ferrule 100 a, and the first and second flexible arms 120 a and 130 a are separated from each other in the x-direction. The first and second arms 120 a and 130 a may be said to generally define a plane (the x-z plane or a plane parallel to the x-z plane). In some embodiments, the plane may contain or substantially contain the first and second arms 120 a and 130 a. In some embodiments, the first and second free ends 124 a and 134 a are separated by a distance d when the ferrule is unmated from a mating ferrule, and are separated by a distance W, which may be greater than d and may be a width of a body of the mating ferrule, when the ferrule is mated to the mating ferrule.

A mating direction of a ferrule refers to a direction along which a ferrule is adapted to be moved in order to mate with a mating ferrule. If a ferrule and a mating ferrule are misaligned so that fine tuning of the relative positions are needed before the ferrules mate, then the orientations of the ferrule and the mating ferrule may be described as not initially aligned along a mating direction. In some embodiments, the ferrule may have a single mating direction; i.e., there may be a single direction along which the ferrule is adapted to be moved relative to a mating ferrule in order to mate with the mating ferrule. As described further elsewhere herein, in some embodiments, a ferrule may have more than one mating direction. For example, in some embodiments the ferrule may be adapted to be moved along a first mating direction, or along a second orthogonal mating direction, or along a vector sum of the first and second mating directions relative to a mating ferrule in order to mate with the mating ferrule.

FIGS. 1B and 1C are a schematic plan view and a schematic side view, respectively, of ferrule assembly 105 including first ferrule 100 a of FIG. 1A and a second ferrule 100 b mated with first ferrule 100 a. Second ferrule 100 b includes a body 110 b, a first flexible arm 120 b and a second flexible arm 130 b opposite the first flexible arm 120 b. Body 110 b includes a first side 117 b and a second side 119 b opposite the first side 117 b. First flexible arm 120 b has a first fixed end 122 b attached to the first side 117 b and an opposite first free end 124 b. Second flexible arm 130 b has a second fixed end 132 b attached to the second side 119 b and an opposite second free end 134 b. The first and second free ends 124 a and 134 a of the first ferrule contact the corresponding opposing first and second sides 117 b and 119 b of the second ferrule 100 b. First free end 124 a contacts body 110 b at contact point 197 b, first free end 124 b contacts body 110 a at contact point 197 a, second free end 134 a contacts body 110 b at contact point 199 b, and second free end 134 b contacts body 110 a at contact point 199 a. First and second ferrules 100 a and 100 b may be electrical, optical or hybrid ferrules and ferrule assembly 105 may be an electrical, an optical, or a hybrid ferrule assembly. First and second sides 117 a and 119 a, and/or first and second sides 117 b and 119 b, may be substantially inflexible or may include substantially inflexible features at the contact points 197 a and 199 a, and/or at the contact points 197 b and 199 b, respectively. In other embodiments, a ferrule assembly may include a first ferrule of the present description mated with a second ferrule which does not include a compliant feature such as a flexible arm.

In FIG. 1B, the first and second free ends 124 a and 134 a of the first and second arms 120 a and 130 a are separated by the width of body 110 b, which may be substantially equal to the width W of body 110 a, and may be greater that the distance d when the ferrules 100 a and 100 b are unmated (see FIG. 1A). Similarly, the first and second ends 124 b and 134 b of the first and second arms 120 b and 130 b are separated by the width W of body 110 a and may be greater that a distance between the first and second ends 124 b and 134 b when the ferrules 100 a and 100 b are unmated.

At least one of the first and second ferrules 100 a and 100 b may have first and second arms (120 a and 130 a or 120 b and 130 b) that have the same or different flexing properties. Such flexing properties may include the Young's modulus of the arms or the force required to deflect the arms by a given amount (which may depend on the Young's modulus and geometric factors such as a diameter or a lateral dimension of the arms). In some embodiments, the first flexing arms (first arms 120 a and 120 b) of the first and second ferrules 100 a and 100 b have same first flexing properties, and the second flexing arms (second arms 130 a and 130 b) of the first and second ferrules have same second flexing properties different than the first flexing properties. In some embodiments, for at least one of the first and second ferrules 100 a or 100 b, one of the first and second flexible arms is more flexible than the other one of the first and second flexible arms.

In the embodiment illustrated in FIG. 1A, the first and second arms 120 a and 130 a of first ferrule 100 a are symmetrically disposed about body 110 a and when first ferrule 100 a is mated with second ferrule 100 b, the first and second arms 120 a and 130 a are flexed away from their corresponding side (first side 117 a and second side 119 a, respectively) of the body 110 a by substantially equal amounts. In other embodiments, the first and second arms may not be disposed symmetrically about the body of the ferrule. In some embodiments, for at least one of the first and second ferrules, one of the first and second flexible arms is flexed away more from its corresponding side of the body and the other one of the first and second flexible arms is flexed away less from its corresponding side of the body.

The bodies 110 a and 110 b can be properly aligned even if the first flexible arms 120 a and 120 b and the second flexible arms 130 a and 130 b have different flexing properties. For example, in some embodiments, first flexible arms 120 a and 120 b have same first flexing properties and second flexible arms 130 a and 130 b have same second flexing properties, with the first flexible arms 120 a and 120 b more flexible than the second flexible arms 130 a and 130 b. The forces on bodies 110 a and 110 b may balance in this case with the bodies aligned as in FIG. 1B.

The second ferrule 100 b may be described as a mating ferrule for the first ferrule 100 a (or vice versa). The z-direction may be described as a mating direction for the ferrules. In some embodiments, when a ferrule (e.g., first ferrule 100 a) is mated with a mating ferrule (e.g., second ferrule 100 b) along a mating direction (e.g., the z-direction), the ferrule and the mating ferrule are adapted to slide relative to one another along a first direction different from the mating direction. The first direction may be a lateral direction, such as the x-direction. In some embodiments, when a ferrule (e.g., first ferrule 100 a) is mated with a mating ferrule (e.g., second ferrule 100 b), the ferrule and the mating ferrule are adapted to slide relative to one another in a plane substantially parallel to a plane generally defined by the first and second flexible arms (e.g., first and second flexible arms 120 a and 130 a). As described elsewhere herein, the first and second arms 120 a and 130 a generally define a plane parallel to the x-z plane. In some embodiments, the first and second ferrules 100 a and 100 b may be adapted to slide relative to one another in a plane substantially parallel to the x-z plane. For example, the first and second ferrules 100 a and 100 b may be adapted to slide relative to each other in the lateral x-direction and/or the z-direction (mating direction).

The first and second flexible arms 120 a and 130 a of the first ferrule 100 a and the first and second flexible arms 120 b and 130 b of the second ferrule 100 b may guide the first and second ferrules 100 a and 100 b into alignment with one another when the first and second ferrules 100 a and 100 b are misaligned. In some embodiments, when the first ferrule 100 a is mated with a second ferrule 100 b along the mating direction (z-direction) and the second ferrule 100 b is misaligned relative to the first ferrule 100 a along a direction different from the mating direction (e.g., misaligned along the x-direction), the flexed first and second flexible arms 120 a and 130 a of the first ferrule 100 a guide the second ferrule 100 b into alignment with the first ferrule 100 a. Similarly, when the first and second ferrules 100 a and 100 b are misaligned, the flexed first and second flexible arms 120 b and 130 b of the second ferrule 100 b may guide the first ferrule 100 a into alignment with the second ferrule 100 b. In some embodiments, when the first and second ferrules 100 a and 100 b are misaligned relative to each other, the flexible arms of the ferrules (120 a, 130 a, 120 b, and 130 b) cooperatively guide the ferrules into alignment with each other. The first and second flexible arms 120 a and 130 a may be described as first and second compliant alignment features of first ferrule 100 a. Similarly, the first and second flexible arms 120 b and 130 b may be described as first and second compliant alignment features of second ferrule 100 b.

In some embodiments, in plan view, the first flexible arm of the first ferrule at least partially overlaps the first flexible arm of the second ferrule, and the second flexible arm of the first ferrule at least partially overlaps the second flexible arm of the second ferrule. In some embodiments, in plan view, the flexible arms of the first and second ferrules on a same side of the ferrule assembly at least partially overlap each other. For example, as illustrated in FIG. 1B, in plan view, the first flexible arm 120 a of the first ferrule 100 a and the first flexible arm 120 b of the second ferrule 100 b partially overlap each other, and the second flexible arm 130 a of the first ferrule 100 a and the second flexible arm 130 b of the second ferrule 100 b partially overlap each other.

In some embodiments, in side view, when the ferrules are fully mated the first flexible arms of the first and second ferrules extend beyond each other, and the second flexible arms of the first and second ferrules extend beyond each other. In some embodiments, in side view, the flexible arms of the first and second ferrules on a same side of the ferrule assembly extend beyond each other. In some embodiments, in side view, the first flexible arms of the first and second ferrules are vertically offset relative to each other, and the second flexible arms of the first and second ferrules are vertically offset relative to each other. In some embodiments, in side view, the flexible arms of the first and second ferrules on a same side of the ferrule assembly are vertically offset relative to each other. For example, as illustrated in FIG. 1C, in side view, first flexible arm 130 a of first ferrule 100 a extends beyond first flexible arm 130 b of second ferrule 100 b since the free end 134 a extends further in the z-direction (mating direction) than the free end 134 b. Also, as illustrated in FIG. 1C, the first flexible arm 130 a of the first ferrule 100 a and the first flexible arm 130 b of the second ferrule 100 b are vertically (y-direction) offset from each other.

In some embodiments, the separation distance between the free ends 124 a and 134 a of the first ferrule 100 a may increase as the first ferrule 100 a moves in the mating direction toward the second ferrule 100 b and may reach a maximum distance when the first and second ferrules 100 a and 100 b are fully mated. In other embodiments, the body of the ferrules may include one or more indented features, latching features, divots or other structures which allow the separation between the arms to decrease when the first and second ferrules 100 a and 100 b are mated relative to a maximum separation that is obtained after the flexible arms of the first ferrule 100 a contact the second ferrule 100 b but before the first and second ferrules 100 a and 100 b are fully mated. This is illustrated FIG. 1D which is a schematic plan view of ferrule 100 d including a body 110 d having a first flexible arm 120 d and a second flexible arm 130 b opposite the first flexible arm 120 d. Body 110 d includes a first side 117 d and a second side 119 d opposite the first side 117 d. First side 117 d includes a first indented or latching feature 114 and second side 119 d includes a second indented or latching feature 115. When ferrule 100 d is fully mated with a mating ferrule having first and second flexible arms (e.g., another ferrule 100 d), the first and second flexible arms of the mating ferrule contact ferrule 100 d at the first and second indented or latching features 114 and 115, respectively. Prior to being fully mated with the mating ferrule, as the ferrule 100 d approaches the mating ferrule along the mating direction (z-direction) a separation between the free ends of the arms of the mating ferrule increases as the free ends contact the body 110 d, reaches a maximum distance and then decreases when the free ends contact the first and second indented or latching features 114 and 115.

In some embodiments, a connector includes a housing and a ferrule of the present description disposed at least partially inside the housing. The housing can function to prevent dirt from interfering with optical connections, for example. The housing can provide the retention force, e.g., via a spring mechanism, to maintain the ferrules in positive contact, as well as a latching and release mechanism for mating and de-mating the connector. In addition, the housing can protect an optical ferrule from outputting stray light that can be a safety hazard to those nearby. In some embodiments, the housing can have a latching mechanism to prevent its accidental opening. In some embodiments, the housing can have a door mechanism that may be opened by the action of mating two connectors.

FIGS. 2A and 2B are a schematic plan view and a side cross-sectional view, respectively, of connector 240 including ferrules 200-1 and 200-2 disposed partially within housing 242 (which is shown as transparent in the figures so that the ferrules are visible). In the illustrated embodiment, ferrule 200-1 includes first and second arms 220-1 and 230-1 and ferrule 200-2 includes a first arm (not illustrated) and a second arm 230-2. In other embodiments, ferrules 200-1 and 200-2 may correspond to ferrule 900 (see FIGS. 9A-9B) or ferrule 1500 (see FIGS. 15A-15C), for example, and may each include first and second alignment features with one of the alignment features expandable or compressible as described elsewhere herein. The z-direction is a mating direction for connector 240. In some embodiments, the housing includes a feature defining a mating direction of the connector. This is illustrated in FIG. 2C which is a schematic plan view of connector 240 c including ferrule 200 c having first and second arms 220 c and 230 c disposed partially in housing 242 c. Housing 242 c includes alignment features 244 that are configured to align connector 240 c with a mating connector. The alignment features 244 define a mating direction for the connector 240 c, which, in the illustrated embodiment, is the z-direction. In some embodiments, the alignment features 244 may mate with corresponding alignment features in a mating connector.

In some embodiments, the ferrules of the present description may be optical ferrules, may be electrical ferrules, or may be hybrid ferrules. In some embodiments, a ferrule of the present description may be an optical ferrule and may include an optically transparent portion for propagating an optical signal therein. In some embodiments, a ferrule of the present description may be an electrical ferrule and may include an electrically conductive portion for propagating an electrical signal therein. For example, ferrule 200 c also includes portion 248, which may be an electrically conductive portion (e.g., portion 248 may include electrically conductive elements that may be used to attach wires to the ferrule 200 c and/or may include electrically conductive elements configured to electrically connect to corresponding electrically conductive elements of a mating ferrule) or may be an optically transparent portion (e.g., portion 248 may include a light redirecting member for changing a direction of light propagating within the ferrule, as described further elsewhere herein).

In the embodiment illustrated in FIGS. 2A-2B, two ferrules are disposed in housing 242. In other embodiments, fewer or more ferrules may be included in housing 242. For example, a connector may include 1, 2, 3, 4, 5, 6 or more ferrules. In some embodiments, a connector may include 1-20 ferrules, or 1-100 ferrules, or 1-250 ferrules, for example, at least partially disposed within a housing of the connector. In some embodiments, the ferrules may be arranged in the connector in a two-dimensional array which may include two or more rows with each row including two or more stacks of ferrules.

The ferrules may be disposed in a connector housing with a major axis of the ferrule aligned with a major axis of the connector housing. Alternatively, the ferrules may be disposed in a connector housing with a major axis of the ferrule at a skew angle relative to a major axis of the connector housing. In this case, the ferrules may be adapted to rotate relative to the connector housing as the connector approaches and engages with a mating connector.

FIGS. 3A-3B show a schematic plan view and a schematic side cross-sectional view, respectively, of connector assembly 345 including mated first and second connectors 340 a and 340 b. First connector 340 a includes a first housing 342 a and a first ferrule 300 a disposed at least partially inside the first housing 342 a (which is shown as transparent in the figures so that the ferrules are visible). Second connector 340 b includes a second housing 342 b and a second ferrule 300 b disposed at least partially inside the second housing 342 b (which is shown as transparent in the figures so that the ferrules are visible). First and second ferrules 300 a and 300 b may correspond to any of the ferrules of the present description, such as, for example, first and second ferrules 100 a and 100 b. In the illustrated embodiment, first ferrule 300 a includes first and second flexible arms 320 a and 330 a, and second ferrule 300 b includes first and second flexible arms 320 b and 330 b. In other embodiments, first and second ferrules 300 a and 300 b may correspond to the ferrules 1000 a and 1000 b (see FIG. 10) or the ferrules 1600 a and 1600 b (see FIG. 16), for example, and may each include first and second alignment features with one of the features expandable or compressible as described elsewhere herein. First and second ferrules 300 a and 300 b are mated together to form ferrule assembly 305. The first and second flexible arms 320 a and 330 a of the first ferrule 300 a are flexed away from the respective first and second sides of the body of the first ferrule 300 a, and the first and second free ends of the flexible arms of the first ferrule 300 a contact the second ferrule 300 b. The first and second flexible arms 320 b and 330 b of the second ferrule 300 b are flexed away from the respective first and second sides of the body of the second ferrule 300 b, and the first and second free ends of the flexible arms of the second ferrule 300 b contact the first ferrule 300 a.

In the embodiment illustrated in FIGS. 3A-3B, a single ferrule is partially disposed in each of the housings 342 a and 342 b when the connectors are disconnected (when the connectors are connected a portion (the arms) of the ferrule of one connector may be partially disposed in the housing of the other connector). In other embodiments, a plurality of ferrules may be at least partially disposed in each of the housings when the connectors are disconnected.

In some embodiments, ferrule 300 a is an optical ferrule adapted to be optically coupled to an optical signal carrier that may include at least one of an optical waveguide, an optoelectronic device, and an optical element. Ferrule 300 a may be adapted to transfer an optical signal carried by the optical signal carrier to ferrule 300 b, which may be a mating optical ferrule. In some embodiments, ferrule assembly 305 may include a first optical signal carrier including at least one of an optical waveguide, an optoelectronic device, and an optical element coupled to ferrule 300 a, and may include a second optical signal carrier including at least one of an optical waveguide, an optoelectronic device, and an optical element coupled to ferrule 300 b. In some embodiments, each of the first and second optical signal carriers includes one or more optical waveguides. In some embodiments, the first optical signal carrier is one or more optical waveguides and the second optical signal carrier is an optical detector. In some embodiments, the optical waveguides include one or more optical fibers. Any of the optical fibers may be a single-mode optical fiber at a wavelength in a range from about 1200 nm to about 1700 nm. Any of the optical fibers may be a multi-mode optical fiber at a wavelength in a range from about 600 nm to about 1700 nm. First ferrule 300 a may be adapted to be optically coupled to an optical signal carrier and transfer an optical signal carried by the optical signal carrier to second ferrule 300 b. First ferrule 300 a may also be adapted to be electrically coupled to an electrically conductive element and transfer an electrical signal carried by the electrically conductive element to the second ferrule 300 b. In some embodiments, each of first and second ferrules 300 a and 300 b is adapted to transfer both optical and electrical signals.

FIG. 3C is a schematic top plan view of connector assembly 345 c which includes the connector assembly 345 of FIG. 3A and includes first and second signal carriers 347 a and 347 b coupled to first and second ferrules 300 a and 300 b, respectively. First signal carrier 347 a includes portion 349 a, and second signal carrier 347 b includes portion 349 b. Each of ferrule 300 a and 300 b may be an electrical ferrule, or may be optical ferrule, or may be a hybrid ferrule. In some embodiments, one or both of first and second signal carriers 347 a and 347 b may be electrical signal carriers such as a first and second wire, respectively, or such as a first and second plurality of wires, respectively. One or both of portions 349 a and 349 b may be electrically conductive elements that may be used to attach the wires to the ferrules. In some embodiments, one or both of first and second signal carriers 347 a and 347 b may be optical signal carriers such as a first and second optical waveguide, respectively, or such as a first and second plurality of optical waveguides, respectively. Portions 349 a and 349 b may include one or more lenses, mirrors, prisms or optical filters, for example. In some embodiments, one or both of first and second signal carriers 347 a and 347 b may be or may include at least one of an optical waveguide, an optoelectronic device, an optical detector, an optical emitter.

In some embodiments, both first and second ferrules 300 a and 300 b are electrical ferrules, both first and second signal carriers 347 a and 347 b are electrical signal carriers, and the first and second ferrules 300 a and 300 b electrically connect the first and second signal carriers 347 a and 347 b. In some embodiments, both first and second ferrules 300 a and 300 b are optical ferrules, both first and second signal carriers 347 a and 347 b are optical signal carriers, and the first and second ferrules 300 a and 300 b optically connect the first and second signal carriers 347 a and 347 b. In some embodiments, both first and second ferrules 300 a and 300 b are hybrid ferrules, both first and second signal carriers 347 a and 347 b carry optical and electrical signals, and the first and second ferrules 300 a and 300 b optically and electrically connect the first and second signal carriers 347 a and 347 b. In some embodiments, first ferrule 300 a is a hybrid ferrule, portion 349 a includes an optoelectronic device (e.g., an optical detector) that receives an optical signal on the first signal carrier 347 a and produces an electrical signal which is transferred to second ferrule 300 b and from second ferrule 300 b to second signal carrier 347 b which may be or may include a wire or a plurality of wires. In some embodiments, first ferrule 300 a is a hybrid ferrule, portion 349 a includes an optoelectronic device (e.g., an optical emitter) that receives an electrical signal on the first signal carrier 347 a and produces an optical signal which is transferred to second ferrule 300 b and from second ferrule 300 b to second signal carrier 347 b which may be or may include an optical fiber or a plurality of optical fibers.

In some embodiments, one or both of first and second signal carriers 347 a and 347 b include a cable that is attached to the respective housing 342 a or 342 b. The cable(s) may be flexed within the housing when the connectors 340 a and 340 b are mated, and compression in the cable(s) may provide a force in the mating direction (z-direction) on the first and second ferrules 300 a and 300 b which help hold the ferrules in position.

In some embodiments, a connector is adapted to mate with a mating connector along a mating direction in a mating plane where the connector has at least one flexing element such that when the connector is mated with the mating connector, the at least one flexing element makes contact with the mating connector and is flexed. The connector and the mating connector may be adapted to slide relative to each other in the mating plane. In some embodiments, when the connector is mated with the mating connector, and the connector and the mating connector are misaligned relative to each other in the mating plane, the flexed flexing element guides the two connectors into alignment with each other. For example, connector 340 a is adapted to mate with connector 340 b along a mating direction (the z-direction) in a mating plane (the x-z plane). Connector 340 a includes at least one flexing element (first and second flexible arms 320 a and 330 a) which guides or helps guide the connectors into alignment with each other. As another example, first ferrule 300 a may be considered to be a connector adapted to mate with second ferule 300 b, which may be considered to be a mating connector. In some embodiments, the housing 342 a of the connector 340 a and/or the housing 342 b of the connector 340 b may also include one or more alignment features, such as alignment features 244 (FIG. 2C), for example.

FIGS. 4A and 4B are a top plan view and a perspective front view, respectively, of ferrule 400 including body 410 and opposing first and second flexible arms 420 and 430 on opposite sides of body 410. First and second arms 420 and 430 are spaced apart from body 410. First arm 420 has a first fixed end 422 attached to the body 410 and has an opposite first free end 424. Second arm 430 has a second fixed end 432 attached to the body 410 and has an opposite second free end 434. Ferrule 400 includes a mating portion 413 disposed between the first and second free ends 424 and 434. Ferrule 400 may be a unitary optical ferrule and may be at least partially disposed in a housing of a connector, such as, for example, connector 240 or 240 c of FIGS. 2A-2C. Ferrule 400 includes optical waveguide alignment member 452 which may be used for receiving, aligning and attaching a plurality of optical waveguides to the ferrule 400. In some embodiments, the plurality of optical waveguides may be permanently attached (e.g., with adhesive) to ferrule 400 through optical waveguide alignment member 452. Optical waveguide alignment member 452 includes a plurality of groves 453, which may be v-grooves. One or more optical waveguides, such as optical fibers, may be attached to one or more of the groves 453. Ferrule 400 also includes light redirecting member 455 for changing a direction of light propagating within the ferrule 400. In some embodiments, light redirecting member 455 includes a plurality of surfaces 456 which can change the direction of light propagating from an optical fiber disposed in a groove 453 in optical waveguide alignment member 452 via total internal reflection (TIR) from one of the plurality of surfaces 456. The plurality of surfaces 456 may be plurality of curved surfaces designed to nominally collimate the light, for example. In some embodiments, surfaces 456 may include a reflective coating, for example, or otherwise be made reflective. In some embodiments, ferrule 400 includes an optical window, e.g., a recessed optical window, on a side of mating portion 413 opposite the light redirecting member 455. The optical window may be coated with an antireflective coating.

In the embodiment illustrated in FIG. 4A, neither of the first and second flexible arms 420 and 430 extend beyond a front most edge 412 of the body 410. The first free end 424 is adjacent to and faces the first side 417 of the body 410, and the second free end 434 is adjacent to and faces the second side 419 of the body 410.

The first and second arms 420 and 430 are configured such that when the ferrule 400 is mated with a mating ferrule, at least one of the arms is flexed away from the body 410, and both free ends 424 and 434 contact the mating ferrule. In some embodiments, the first and second arms 420 and 430 have the same or about the same flexibility. In some embodiments, one of the arms is substantially more flexible than the other. In some embodiments, one, but not both, of the arms is substantially rigid. In some cases, ferrule 400 may be mated with another ferrule that also includes a mating portion disposed between free ends of two arms. In some embodiments, when the ferrule 400 is mated with another ferrule and the two ferrules are misaligned relative to each other, the opposing arms of the two ferrules cooperatively direct the two mating portions to slide over each other bringing the two ferrules into alignment with each other.

In some embodiments, as ferrule 400 moves along a mating direction toward a mating ferrule, the free ends 424 and 434 of the first and second flexible arms 420 and 430 contact the mating ferrule, and as the ferrule 400 continues to move along the mating direction (the z-direction) toward the mating ferrule, the flexible arms begin to flex away from the body while remaining in contact with the mating ferrule, so that the flexible arms are maximally flexed away from the body when the ferrule is mated with the mating ferrule. The separation distance between the free ends 424 and 434 may increase as the ferrule 400 moves in the mating direction toward the mating ferrule and may reach a maximum distance when the ferrule 400 is mated with the mating ferrule. In other embodiments, the body of the mating ferrule may include divots or other structures which allow the separation between the arms to decrease when the ferrule is mated with the mating ferrule relative to a maximum separation that is obtained after the flexible arms contact the mating ferrule but before the ferrule is mated with the mating ferrule.

FIGS. 5A-5E are perspective, top plan, bottom plan, back view and front view, respectively, of ferrule assembly 505 including mated first and second ferrules 500 a and 500 b. Each of the first and second ferrules 500 a and 500 b may correspond to ferrule 400. First ferrule 500 a includes body 510 a and opposing first and second arms 520 a and 530 a on opposite sides of body 510 a. First and second arms 520 a and 530 a include first and second free ends 524 a and 534 a, respectively, and include first and second fixed ends 522 a and 532 a, respectively. First ferrule 500 a includes optical waveguide alignment member 552 a and light redirecting member 555 a. Second ferrule 500 b includes body 510 b and opposing first and second arms 520 b and 530 b on opposite sides of body 510 b. First and second arms 520 b and 530 b include first and second free ends 524 b and 534 b, respectively, and include first and second fixed ends 522 b and 532 b, respectively. Second ferrule 500 b includes optical waveguide alignment member 552 b and light redirecting member 555 b. First ferrule 500 a includes mating portion 513 a and second ferrule 500 b includes mating portion 513 b. The mating portions 513 a and 513 b are stacked in a direction (y-direction) perpendicular to the mating direction (z-direction). In some embodiments, the mating portions 513 a and 513 b are adapted to slide relative to each other.

In some embodiments, an alignment frame for facilitating a mating of a first ferrule to a second ferrule along a mating direction is provided. This is illustrated in FIGS. 6A-6C which are schematic top views of alignment frame 660 including base 662 having opposing ends 664 and 666, and first and second arms 670 and 671 extending from opposing ends 664 and 666. Alignment frame 660 can be used with any type of ferrule, for example, electrical ferrules, optical ferrules, or hybrid ferrules. First arm 670 includes spaced apart first and second flexible features 672 and 674 disposed on an inner surface 663 of first arm 670 facing second arm 671, and second arm 671 includes spaced apart third and fourth flexible features 676 and 678 disposed on inner surface 665 of second arm 671 facing first arm 670. First arm 670 includes first and second portions 673 and 675 and second arm 671 includes first and second portions 677 and 679. First portion 673 and first portion 677 are relatively closer to the base 662 and second portion 675 and second portion 679 are relatively farther from the base 662. First flexible feature 672 is disposed on first portion 673 of first arm 670, second flexible feature 674 is disposed on second portion 675 of first arm 670, third flexible feature 676 is disposed on first portion 677 of second arm 671, and fourth flexible feature 678 is disposed on second portion 679 of second arm 671.

As illustrated in FIG. 6B, in some embodiments, the first and second flexible features 672 and 674 lie on a first straight line 686 substantially parallel to the mating direction (the z-direction), and the third and fourth flexible features 676 and 678 lie on a second straight line 688 different than and substantially parallel to the first straight line 686. In some embodiments, the first and third flexible features 672 and 676 lie on a third straight line 684 substantially perpendicular to the mating direction, and the second and fourth flexible features 674 and 678 lie on a fourth straight line 682 different than and substantially parallel to the third straight line 684. In some embodiments, the first, second, third and fourth flexible features 672, 674, 676 and 678 lie substantially in a same plane (e.g., the x-z plane of FIGS. 6A-6C).

First and second flexible features 672 and 674 may be flexible by being made of a flexible (e.g., elastic) material and/or first and second flexible features 672 and 674 may be flexible by virtue of being disposed on first arm 670 which may be flexible. Similarly, third and fourth flexible features 676 and 678 may be flexible by being made of a flexible (e.g., elastic) material and/or third and fourth flexible features 676 and 678 may be flexible by virtue of being disposed on second arm 671 which may be flexible. The first and second flexible features 672 and 674 may have substantially the same or different flexing properties, and the third and fourth flexible features 676 and 678 may have substantially the same or different flexing properties. The first and second portions 673 and 675 of first arm 670 may have substantially the same or different flexing properties and the first and second portions 677 and 679 of second arm 671 may have substantially the same or different flexing properties. The first and third flexible features 672 and 676 may have substantially the same first flexing properties and the second and fourth flexible features 674 and 678 may have substantially the same second flexing properties. The first and second flexing properties may be the substantially the same or may be different. The flexing properties may include an elastic modulus or may include the force required to deflect a flexible feature by a given amount or by a given percentage. Flexing properties can be adjusted by selecting materials to give a desired modulus (e.g., Young's modulus), for example, or by adjusting geometric parameters (e.g., diameters, or lateral dimensions, of the first and second arms or of the first and/or second portions) of the first and second arms 670 and 671 and/or of the flexible features 672, 674, 676 and 678.

When the alignment frame is not engaging a ferrule, the opposing first and third flexible features are separated by a distance d⁰ ₁₃ and the opposing second and fourth flexible features 674 and 678 are separated by a distance d⁰ ₂₄. In some embodiments, when the alignment frame 660 facilitates a mating of a first ferrule to a second ferrule resulting in the first ferrule being mated to the second ferrule, the first and second flexible features 672 and 674 are flexed in a same first direction (the positive x-direction), and the third and fourth flexible features 676 and 678 are flexed in a same second direction (the negative x-direction) opposite the first direction. In some embodiments, when the alignment frame 660 facilitates a mating of a first ferrule to a second ferrule resulting in the first ferrule being mated to the second ferrule, the opposing first and third flexible features 672 and 676 are each flexed outwardly by the first ferrule a first distance and the opposing second and fourth flexible features 674 and 678 are each flexed outwardly by the second ferrule a second distance greater than the first distance. This is schematically illustrated in FIGS. 6A-C.

FIG. 6A shows the positions of the flexible features and the arms when the alignment frame 600 is not engaging a ferrule. FIG. 6C shows the positions of the flexible features and the arms that could be obtained when the alignment frame 600 facilitates the mating of first and second ferrules (not shown). The first and third flexible features 672 and 676 are separated by a distance d⁰ ₁₃ prior to engaging the first and second ferrules and are separated by a distance d₁₃ after engaging the first and second ferrules. Similarly, the second and fourth flexible features 674 and 678 are separated by a distance d⁰ ₂₄ prior to engaging the first and second ferrules and are separated by a distance d₂₄ after engaging the first and second ferrules. The first and second arms 670 and 671 may be curved outward from each other. The difference between d₂₄ and d⁰ ₂₄ may be greater than the difference between d₁₃ and d⁰ ₁₃ and may be greater than a distance that would have been obtained if the first and second arms 670 and 671 did not curve outward from one another.

FIG. 7A is a perspective view of alignment frame 760 configured to facilitate the mating of first and second ferrules 700 a and 700 b and thereby providing a connection between first and second signal carriers 747 a and 747 b, which in the illustrated embodiment, are optical fibers in a fiber ribbon. In other embodiments, the first and/or the second signal carriers may be electrical or hybrid signal carriers (e.g., a cable with both optical fibers and copper conductors). First ferrule 700 a includes a mating portion 713 a and second ferrule 700 b includes a corresponding mating portion 713 b. Alignment frame 760 includes base 762 having opposing first and second ends 764 and 766, and includes opposing first and second arms 770 and 771 which extend forwardly from the opposing ends 764 and 766 of the base 762. First arm 770 includes spaced apart first and second flexible features 772 and 774 disposed on an inner surface of the first arm 770 and facing the second arm 771, and second arm 771 includes spaced apart first and second features 776 and 778 disposed on an inner surface of the second arm 771 and facing the first arm 770. When the alignment frame 760 facilitates the mating of the first ferrule 700 a to the second ferrule 700 b resulting in the first ferrule 700 a being mated to the second ferrule 700 b, the opposing first and third flexible features 772 and 776 are flexed and in contact with the first ferrule 700 a, and the opposing second and fourth flexible features 774 and 778 are flexed and in contact with the second ferrule 700 b. In some embodiments, when the alignment frame 760 facilitates the mating of the first ferrule 770 a to the second ferrule 700 b resulting in the first ferrule 700 a being mated to the second ferrule 700 b, the first and second ferrules 700 a and 700 b are disposed, at least partially, between the first and second arms 770 and 771.

FIG. 7B is a top view of first and second ferrules 700 a and 700 b with alignment frame 760 configured to facilitate the mating of first and second ferrules 700 a and 700 b. First ferrule 700 a include inflexible features 716 a and 718 a and second ferrule 700 b includes inflexible features 716 b and 718 b. Inflexible features 716 a, 718 a, 716 b, and 718 b may provide insertion stops 721 a, 723 a, 721 b, and 723 b, respectively, which limit the extent of relative movement of the first and second ferrules 700 a and 700 b in the mating direction (the z-direction). Alignment frame 760 also includes stop portions 761 which are configured to abut a side of the first ferrule 700 a opposite the mating portion 713 a.

FIG. 7C shows first and second ferrules 700 a and 700 b mated with alignment frame 760 facilitating the mating. Plane 782 is perpendicular to the mating direction (the z-direction) and parallel to the x-y plane, and connects the second and fourth flexible features 774 and 778. Plane 784 is perpendicular to the mating direction and parallel to the x-y plane, and connects the first and third flexible features 772 and 776. In some embodiments, when the alignment frame 760 facilitates a mating of a first ferrule 700 a to a second ferrule 700 b along a mating direction (the z-direction) resulting in the first ferrule 700 a being mated to the second ferrule 700 b, the plane 782, which is perpendicular to the mating direction and connects the second and fourth flexible features 774 and 778, intersects both the first and second ferrules 700 a and 700 b, and the plane 784, which is perpendicular to the mating direction and connects the first and third flexible features 772 and 776, intersects both the first and second ferrules 700 a and 700 b. In other embodiments, the first and third flexible features 772 and 776 are disposed closer to the first and second ends 764 and 766 so that the plane 784 connecting the first and third flexible features 772 and 776 intersects only the first ferrule 700 a. In some embodiments, alignment frame 760 and first ferrule 700 a may be disposed at least partially in a first connector housing and second ferrule 700 b may be disposed at least partially in a second connector housing.

The first and second flexible features 772 and 774 may have substantially the same or different flexing properties. The third and fourth flexible features 776 and 778 may have substantially the same or different flexing properties. In some embodiments, the first and third flexible features 772 and 776 have substantially the same first flexing properties, and the second and fourth flexible features 774 and 778 have substantially the same second flexing properties. The second flexing properties may be substantially the same or different from the first flexing properties. In some embodiments, each of the first and second flexible features 772 and 774 is flexible, at least in part, by virtue of the first arm 770 being flexible, and each of the third and fourth flexible features 776 and 778 is flexible, at least in part, by virtue of the second arm 771 being flexible.

In some embodiments, when the alignment frame 760 facilitates a mating of a first ferrule 700 a to a second ferrule 700 b resulting in the first ferrule 700 a being mated to the second ferrule 700 b, the opposing first and third flexible features 772 and 776 are flexed and in contact with corresponding inflexible features 716 a and 718 a, respectively, on the first ferrule 700 a, and the opposing second and fourth flexible features 774 and 778 are flexed and in contact with corresponding inflexible features 716 b and 718 b, respectively, on the second ferrule 700 b. In some embodiments, when the alignment frame 760 facilitates a mating of a first ferrule 700 a to a second ferrule 700 b along a mating direction (the z-direction) in a mating plane (the x-z plane) resulting in the first ferrule 700 a being mated to the second ferrule 700 b, and the first and second ferrules 700 a and 700 b are misaligned relative to each other in the mating plane, the first, second, third and fourth flexible features 772, 774, 776 and 778 cooperatively guide the first and second ferrules 700 a and 700 b into alignment with each other.

FIG. 8A is a perspective view of alignment frame 860 including base 862 having opposing ends 864 and 866, and first and second arms 870 and 871 extending from the opposing ends 864 and 866. Alignment frame 860 also includes stop portions 861 which are configured to abut a side of a ferrule opposite a mating portion of the ferrule. A front portion 875 of first arm 870 splits into lower and upper beams 867 a and 867 b, respectively. First flexible feature 872 is disposed on an inner surface 863 a of lower beam 867 a and second flexible feature 874 is disposed on an inner surface 863 b of upper beam 867 b. A front portion 879 of second arm 871 splits into lower and upper beams 868 a and 868 b. Third flexible feature 876 is disposed on an inner surface (corresponding to inner surface 863 a) of lower beam 868 a and fourth flexible feature 878 is disposed on an inner surface (corresponding to inner surface 863 b) of upper beam 868 b.

In some embodiments, each of the first and second flexible features 872 and 874 is flexible, at least in part, by virtue of the upper and lower beams 867 b and 867 a of the first arm 870 being flexible, and each of the third and fourth flexible features 876 and 878 is flexible, at least in part, by virtue of the upper and lower beams 868 b and 868 a of the second arm 871 being flexible.

FIG. 8B is a perspective view of a portion of the alignment frame 800 engaged with first ferrule 800 a. First ferrule 800 a includes inflexible features 818 a which are in contact with first and third flexible features 872 and 876 on the respective lower beams 867 a and 868 a. First ferrule 800 a includes light redirecting member 855 which includes a plurality of surfaces 856 of a plurality of curved mirrors 857 and which is attached to signal carrier 847 a which includes a plurality of optical waveguides 846 a. The plurality of optical waveguides 846 a may be or may include a plurality of optical fibers. In some embodiments, light redirecting member 855 includes a plurality of surfaces 856 which can change the direction of light propagating from the optical waveguides 846 a into light redirecting member 855 via total internal reflection (TIR) from the plurality of surfaces 856. In some embodiments, surfaces 856 may include a reflective coating, for example, or otherwise be made reflective. In some embodiments, first ferrule 800 a may include a waveguide alignment member as described elsewhere herein. In some embodiments, first ferrule 800 a includes an opposing optical window opposite the light redirecting member. Second ferrule 800 b (see FIG. 8C) includes optical window 895 and may include an opposing light redirecting member. The optical window 895 may be coated with an antireflective coating.

FIG. 8C is a perspective view of the alignment frame 860 engaged with the first ferrule 800 a and disposed to facilitate a mating of the first ferrule 800 a to a second ferrule 800 b. Second ferrule 800 b includes inflexible features 816 b and 818 b. Second ferrule 800 b is connected to signal carrier 847 b which may include a plurality of optical fibers. First and second ferrules 800 a and 800 b may be hermaphroditic ferrules and may be unitary ferrules.

In some embodiments, when the alignment frame 860 facilitates a mating of a first ferrule 800 a to a second ferrule 800 b resulting in the first ferrule 860 a being mated to the second ferrule 800 b, the lower beams 867 a and 868 a of the first and second flexible arms 870 and 871 are flexed and in contact with corresponding inflexible features 816 a and 818 a on the first ferrule 800 a, and the upper beams 867 b and 868 b of the first and second flexible arms 870 and 871 are flexed and in contact with corresponding inflexible features 816 b and 818 b on the second ferrule 800 b. In other embodiments, the inflexible features 816 a, 818 a, 816 b, and 818 b may be disposed such that the lower beams 867 a and 868 a of the first and second flexible arms 870 and 871 are flexed and in contact with corresponding inflexible features 816 b and 818 b on the second ferrule 800 b, and the upper beams 867 b and 868 b of the first and second flexible arms 870 and 871 are flexed and in contact with corresponding inflexible features 816 a and 818 a on the first ferrule 800 a.

In some embodiments, a ferrule may have first and second alignment features where one of the features is expandable or where one of the features is compressible. A feature may be said to be expandable or compressible if it is substantially more expandable or compressible than a body of the ferrule. An expandable opening can be provided by including compliant features on opposing sides of the opening. The opposing compliant features may be opposing flexible arms or may be layers of an elastomeric material more compliant that the body of the ferrule disposed on opposite sides of the opening, for example. A compressible feature can be provided by including compliant features on opposing sides of the feature. The opposing compliant features may be opposing flexible arms or may be layers of an elastomeric material more compliant that the body of the ferrule disposed on opposite sides of the compressible feature, for example.

FIGS. 9A-9B are schematic plan views of ferrule 900 having a first feature 901 and second feature 911. The first and second features 901 and 911 are alignment features for mating with corresponding alignment features of a mating ferrule. The second feature 911 is expandable and defines an expandable opening 913 which has an unexpanded state illustrated in FIG. 9A and an expanded state illustrated in FIG. 9B. Inserting an object having the size and the shape of the first feature 901 into the opening 913 expands the opening 913 from the unexpanded state to the expanded state. The second feature 911 includes a first flexible arm 920 having a first fixed end 922 attached to a to a first side 917 of the opening 913 and an opposite first free end 924, and includes a second flexible arm 930 having a second fixed end 932 attached to a second side 919 of the opening 913, opposite the first side 917, and an opposite second free end 934, such that when the opening 913 is in the unexpanded state, the first and second free ends 924 and 934 are separated by a first distance d1 and when the expandable opening is in the expanded state, the first and second free ends 924 and 934 are separated by a second distance d2 greater than the first distance d1. The first and second arms 920 and 930 are opposing first and second compliant features, respectively. In the unexpanded state, the first and second arms 920 and 930 are in an unflexed state and in the expanded state, the first and second arms 920 and 930 are in a flexed state.

The first feature 901 is located at a first location 927 along a ferrule mating direction (z-direction) of the ferrule 900, and the second feature 911 is located at a substantially different second location 929 along the ferrule mating direction. When the ferrule 900 is mated with a mating ferrule along the ferrule mating direction, the first and second features 901 and 911 substantially simultaneously engage corresponding alignment features of the mating optical ferrule. In the illustrated embodiment, the first location 927 is at a front 907 of the ferrule 900 and the second location is at a rear 909 of the optical ferrule. In other embodiments, the first and second locations may be at some skew angle relative to a major axis of the ferrule.

First and second locations 927 and 929 along the ferrule mating direction may be said to be substantially different if there is some non-zero spacing between the closest portions of the first and second alignment features along the mating direction. Alignment features disposed on a same side of a ferrule located in an x-y plane, for example, would not be said to have substantially different locations along the z-axis, for example, since in this case there would be zero spacing between the closest portions of the alignment features along the z-axis.

The first feature 901 of the ferrule 900 may be adapted to contact a corresponding alignment feature (which may have the size and shape of second feature 911) of a mating ferrule. Similarly, the second feature 911 of the ferrule 900 may be adapted to contact a corresponding alignment feature (which may have the size and shape of first feature 901) of a mating ferrule. In some embodiments, ferrule 900 has a length direction (e.g., z-direction) and a thickness direction (e.g., y-direction), and the ferrule 900 may be adapted to mate with a mating ferrule along the length direction of the ferrule. The first feature 901 may be adapted to contact a corresponding feature of the mating ferrule at a first contact region of the first feature 901 (e.g., at a side of first feature 901), and the second feature 911 may be adapted to contact a corresponding alignment feature of the mating ferrule at a second contact region of the second feature 911 (e.g., at an inner side of first and second arms 920 and 930). The first contact region of the first feature 901 may be displaced from the second contact region of the second feature 911 along the thickness direction as well as along the length direction. In some embodiments, the first and second contact regions may also be displaced from each other along a transverse direction (e.g., x-direction).

As described further elsewhere herein, in some embodiments, the ferrule 900 is adapted to mate with a mating ferrule along each of two orthogonal dimensions of the ferrule. The two orthogonal dimensions may be length (along z-direction) and thickness (along y-direction) dimensions of the ferrule 900.

Ferrule 900 may be any type of ferrule, for example, an electrical ferrule, an optical ferrule, or a hybrid ferrule. In some embodiments, ferrule 900 is an optical ferrule adapted to receive and transmit light. In some embodiments, ferrule 900 is adapted to optically couple to an optical signal carrier and transfer an optical signal carried by the optical signal carrier to a mating ferrule. The optical signal carrier may include a portion (corresponding to portions 349 a and 349 b, for example) that may be or may include at least one of an optical waveguide, an optoelectronic device, an optical detector, an optical emitter, and/or an optical element which may be or may include one or more prisms, or one or more optical filters, or one or more optical waveguides, for example. In some embodiments, ferrule 900 includes at least one light redirecting element for receiving light along a length direction (z-direction) of the ferrule and redirecting the received light along a thickness direction (y-direction) of the ferrule 900. The light redirecting elements may correspond to any of the light redirecting elements described elsewhere herein.

In some embodiments, ferrule 900 is hermaphroditic and in some embodiments, ferrule 900 is unitary. In some embodiments, when ferrule 900 is mated with a mating ferrule, which may have the same size and shape as ferrule 900, the first and second features 901 and 911 of the ferrule 900 and first and second alignment features of the mating ferrule may guide the ferrule 900 and the mating ferrule into alignment with one another when the ferrule 900 and the mating ferrule are misaligned.

In some embodiments, a connector is provided that includes a housing and at least one ferrule 900 disposed at least partially inside the housing. For example, any or all of ferrules 200-1, 200-2, 200-C, or 300 a and 300 b in FIGS. 2A-3C can be replaced in their respective housings with ferrule 900.

FIG. 10 is a perspective view of ferrule assembly 1005 including optical ferrule 1000 a and mating optical ferrule 1000 b mated together. Optical ferrule 1000 a includes first alignment feature 1001 a, second alignment feature 1011 a, and opposing first and second compliant features 1020 a and 1030 a, which, in the illustrated embodiment, comprise first and second flexible arms. Mating optical ferrule 1000 b includes second alignment feature 1001 b adapted to engage second alignment feature 1011 a, and first alignment feature 1011 b adapted to engage first alignment feature 1001 a. First alignment feature 1011 b includes opposing first and second compliant features 1020 b and 1030 b.

Second alignment feature 1011 a of optical ferrule 1000 a defines an expandable opening 1013 a and first alignment feature 1011 b of mating optical ferrule 1000 b defines an expandable opening 1013 b. First alignment feature 1001 a is inserted into expandable opening 1013 b which is in an expanded state. Similarly, second alignment feature 1001 b is inserted into expandable opening 1013 a which is in an expanded state. Optical ferrule 1000 a includes waveguide alignment member 1052 a and light redirecting member 1055 a which may correspond to any waveguide alignment members and light redirecting members, respectively, described elsewhere herein. Light redirecting member 1055 a includes a plurality of light redirecting elements 1057 a for receiving light along a length direction 1059 and redirecting the received light along a thickness direction 1069 of the optical ferrule. Mating ferrule 1000 b may also include a corresponding waveguide alignment member and a corresponding light redirecting member. Optical ferrule 1000 a and mating optical ferrule 1000 b may each be hermaphroditic and may each be unitary.

In some embodiments, the ferrules of the present description may be adapted to mate with a mating ferrule along each of two orthogonal dimensions of the ferrule, i.e., there may be two orthogonal directions (relative to major axes of the ferrule, for example) along which the ferrule is adapted to be moved relative to a mating ferrule in order to mate with the mating ferrule. Optical ferrule 1000 a and mating optical ferrule 1000 b are adapted to mate along a length direction 1059 (direction along the length dimension) which is a mating direction of the ferrules. Optical ferrule 1000 a and mating optical ferrule 1000 b may also be adapted to mate along the orthogonal thickness direction 1069 (direction along the thickness dimension). Optical ferrule 1000 a and mating optical ferrule 1000 b can approach the mated position shown in FIG. 10 by moving the ferrules together along the thickness direction 1069, or by moving the ferrules together along the length direction 1059, or by moving the ferrules together along a direction intermediate between the thickness direction 1069 and the length direction 1059.

FIGS. 11A-11B are top perspective and bottom perspective views, respectively, of ferrule assembly 1105 including optical ferrules 1100 a and mating optical ferrule 1100 b. Optical ferrule 1100 a includes first alignment feature 1101 a and a second alignment feature 1111 a which defines an expandable opening. Mating optical ferrule 1100 b includes second alignment feature 1101 b and first alignment feature 1111 b which defines an expandable opening. First alignment feature 1111 b may be described as a corresponding alignment feature for first alignment feature 1101 a since first alignment feature 1111 b is adapted to engage first alignment feature 1101 a. Similarly, second alignment feature 1101 b may be described as a corresponding alignment feature for second alignment feature 1111 a since second alignment feature 1111 b is adapted to engage second alignment feature 1111 a. First alignment feature 1101 a is inserted into first alignment feature 1111 b which is in an expanded state. Similarly, second alignment feature 1101 b is inserted into second alignment feature 1111 a which is in an expanded state. Optical ferrule 1100 a is attached to signal carrier 1147 a which includes a plurality of optical fibers 1146 a and mating optical ferrule 1100 b is attached to signal carrier 1147 b which includes a plurality of optical fibers 1146 b.

Any of the ferrules described herein, such as ferrules 1000 a, 1000 b, 1100 a, or 1100 b, may be disposed in a connector housing such as any of those illustrated in FIGS. 2A-3C.

In some embodiments, a ferrule includes first and second alignment features having a size and shape such that when the optical ferrule is mated with a corresponding mating optical ferrule along a mating direction, the first and second alignment features are adapted to provide a force along the mating direction directed to hold the ferrules together. When the ferrule and the corresponding second ferrule are moved apart along the mating direction, the first and second alignment features may be adapted to provide a restoring force along the mating direction. Such features may keep the ferrule and the mating ferrule positively registered and are illustrated in FIGS. 12A-14.

FIGS. 12A-12B are schematic top and side views, respectively of ferrule 1200. Ferrule 1200 includes a lower portion 1251 that includes first alignment feature 1201, and an upper portion 1254 that includes second alignment feature 1211. Second alignment feature 1211 includes opposing first and second compliant features 1220 and 1230 and defines an expandable opening 1213. First alignment feature 1201 and second alignment feature 1211 are offset relative to one another along the length direction (z-direction) and the thickness direction (y-direction).

FIGS. 13A-13B are schematic top and side views, respectively of ferrule 1300 corresponding to ferrule 1200. Ferrule 1200 and ferrule 1300 may be hermaphroditic and may have the same size and shapes. Ferrule 1300 includes upper portion 1351, lower portion 1354 (see FIG. 13B) and alignment feature 1301 which has the same size and shape as first alignment feature 1201 and which is adapted to engage second alignment feature 1211. Ferrule 1300 may also include an alignment feature adapted to engage first alignment feature 1201.

FIG. 14 is a schematic top view of ferrule assembly 1405 including ferrule 1200 mated with ferrule 1300. Alignment feature 1301 of ferrule 1300 is engaged with second alignment feature 1211 of ferrule 1200 and the first alignment feature 1201 of ferrule 1200 may be engaged with a corresponding alignment feature (not illustrated) of ferrule 1300. The alignment features 1301 and 1211 have a size and shape such that a force may be present along the z-direction directed to hold the ferrules 1200 and 1300 together. When the ferrules 1200 and 1300 are moved apart along the z-direction, the alignment features 1301 and 1211 may be adapted to provide a restoring force along the z-direction. The geometry of the alignment features may provide a latch and an extra force may be required to mate and un-mate the ferrules compared to other embodiments.

In some embodiments, a ferrule may have first and second alignment features where one of the alignment features is compressible. FIGS. 15A and 15B are schematic top views of ferrule 1500 including an upper portion 1554 which includes a first feature 1501 and a lower portion 1551 which includes a second feature 1511. FIG. 15C is a schematic side view of ferrule 1500. The first and second features 1501 and 1511 are alignment features for mating with corresponding alignment features of a mating ferrule. In FIG. 15A, second feature 1511 is in an uncompressed state and in FIG. 15B, second feature 1511 is in a compressed state. Inserting the compressible second feature 1511 into an opening of an object where the opening has the size and shape of the first feature 1501, compresses the second feature from the uncompressed state to the compressed state. Second feature 1511 includes a body 1506 with opposing first and second sides 1517 and 1519 and includes first and second compliant features 1520 and 1530 on the opposite sides 1517 and 1519 of the body 1506. In the illustrated embodiment, the first compliant feature 1520 is a first flexible arm having a first fixed end 1522 attached to the first side 1517 of body 1506 and having an opposite first free end 1524. Similarly, in the illustrated embodiment, the second compliant feature 1530 is a second flexible arm having a second fixed end 1532 attached to the second side 1519 of the body 1506 and having an opposite second free end 1534.

When the second feature 1511 is in the compressed state (FIG. 15B), the first and second free ends 1524 and 1534 are separated by a first distance d1 and when the second feature 1511 is in the uncompressed state (FIG. 15A), the first and second free ends 1524 and 1534 are separated by a second distance d2 greater than the first distance d1. In the uncompressed state, the first and second arms 1520 and 1530 are in an unflexed state and in the compressed state, the first and second arms 1520 and 1530 are in a flexed state.

The first feature 1501 of the ferrule 1500 may be adapted to contact a corresponding alignment feature (which may have the size and shape of second feature 1511) of a mating ferrule. Similarly, the second feature 1511 of the ferrule 1500 may be adapted to contact a corresponding alignment feature (which may have the size and shape of first feature 1501) of a mating ferrule. In some embodiments, ferrule 1500 has a length direction (e.g., z-direction) and a thickness direction (e.g., y-direction), and the ferrule 1500 may be adapted to mate with a mating ferrule along the length direction of the ferrule. The first feature 1501 may be adapted to contact a corresponding feature of the mating ferrule at a first contact region of the first feature 1501 (e.g., at opposing sides of first feature 1501), and the second alignment feature 1511 may be adapted to contact a corresponding alignment feature of the mating ferrule at a second contact region of the second alignment feature 1511 (e.g., at an outer side of first and second arms 1520 and 1530). The first contact region of the first feature 1501 may be displaced from the second contact region of the second feature 1511 along the thickness direction as well as along the length direction. In some embodiments, the first and second contact regions may also be displaced from each other along a transverse direction (e.g., x-direction).

As described further elsewhere herein, in some embodiments, the ferrule 1500 is adapted to mate with a mating ferrule along each of two orthogonal dimensions of the ferrule. The two orthogonal dimensions may be length (along z-direction) and thickness (along y-direction) dimensions of the ferrule 1500.

Ferrule 1500 may be any type of ferrule, for example, an electrical ferrule, an optical ferrule, or hybrid ferrule. In some embodiments, ferrule 1500 is an optical ferrule adapted to receive and transmit light. In some embodiments, ferrule 1500 is adapted to optically couple to an optical signal carrier and transfer an optical signal carried by the optical signal carrier to a mating ferrule. The optical signal carrier may include a portion (corresponding to portions 349 a and 349 b, for example) that may be or may include at least one of an optical waveguide, an optoelectronic device, an optical detector, an optical emitter, and/or an optical element which may be or may include one or more prisms, or one or more optical filters, or one or more optical waveguides, for example. In some embodiments, ferrule 1500 includes at least one light redirecting element for receiving light along a length direction (z-direction) of the ferrule and redirecting the received light along a thickness direction (y-direction) of the ferrule 1500. The light redirecting elements may correspond to any of the light redirecting elements described elsewhere herein.

In some embodiments, ferrule 1500 is hermaphroditic and in some embodiments, ferrule 1500 is unitary. In some embodiments, when ferrule 1500 is mated with a mating ferrule, which may have the same size and shape as ferrule 1500, the first and second features 1501 and 1511 of the ferrule 1500 and first and second features of the mating ferrule may guide the ferrule 1500 and the mating ferrule into alignment with one another when the ferrule 1500 and the mating ferrule are misaligned.

In some embodiments, a connector is provided that includes a housing and at least one ferrule 1500 disposed at least partially inside the housing. For example, any or all of ferrules 200-1, 200-2, 200-C, or 300 a and 300 b in FIGS. 2A-3C can be replaced in their respective housings with ferrule 1500.

FIG. 16 is a perspective view of first and second optical ferrules 1600 a and 1600 b. First and second optical ferrules 1600 a and 1600 b may be hermaphroditic, may be unitary, and may have substantially the same size and shape. First optical ferrule 1600 a is adapted to mate with second optical ferrule 1600 b along a length direction 1659 (direction along the length dimension of first ferrule 1600 a), which is a mating direction of the ferrules, and along the orthogonal thickness direction 1669 (direction along the thickness dimension of first ferrule 1600 a), which is also a mating direction for the ferrules.

First optical ferrule 1600 a includes waveguide alignment member 1652 a and light redirecting member 1655 a which may correspond to any waveguide alignment members and light redirecting members, respectively, described elsewhere herein. First optical ferrule 1600 a may also include an optical window on an opposite side of the first optical ferrule 1600 a from the light redirecting member 1655 a. Second optical ferrule 1600 b includes an optical window 1695 b and may also include a light redirecting member on an opposite side of the second optical ferrule 1600 b from the optical window 1695 b. The optical windows 1695 b and/or a corresponding optical window of first optical ferrule 1600 a may be coated with an antireflective coating.

The first alignment feature 1601 a of the first optical ferrule 1600 a is adapted to contact a corresponding alignment feature (second alignment feature 1611 b) of the second optical ferrule 1600 b at a first contact region 1681 a of the first alignment feature 1601 a, and the second alignment feature 1611 a of the first optical ferrule 1600 a is adapted to contact a corresponding alignment feature (first alignment feature 1601 b) of the second optical ferrule 1600 b at a second contact region 1683 a of the second alignment feature 1611 a. In some embodiments, the first and second contact regions 1681 a and 1683 a are offset relative to one another along at least the length and thickness directions 1659 and 1669 of the first optical ferrule 1600 a. Similarly, the first alignment feature 1601 b of the second optical ferrule 1600 b is adapted to contact a corresponding alignment feature (second alignment feature 1611 a) of the first optical ferrule 1600 a at a first contact region 1681 b of the first alignment feature 1601 b, and the second alignment feature 1611 b of the second optical ferrule 1600 b is adapted to contact a corresponding alignment feature (first alignment feature 1601 a) of the first optical ferrule 1600 a at a second contact region 1683 b of the second alignment feature 1611 b. In some embodiments, the first and second contact regions 1681 b and 1683 b are offset relative to one another along at least the length and thickness dimensions of the second optical ferrule 1600 b.

FIG. 17A is a perspective view of ferrule assembly 1705 including first optical ferrule 1700 a mated to second optical ferrule 1700 b. Second optical ferrule 1700 b is shown as semi-transparent for ease of illustration. The first optical ferrule 1700 a has length dimension 1759 and an orthogonal thickness dimension 1769 along orthogonal length and thickness directions. Second optical ferrule 1700 b similarly has orthogonal length and thickness dimensions. FIG. 17B is a perspective view showing the first and second optical ferrules 1700 a and 1700 b separated along the length dimension 1759 from the fully mated configuration of FIG. 17A. FIG. 17C is a perspective view showing the first and second optical ferrules 1700 a and 1700 b separated along the thickness dimension 1769 from the fully mated configuration of FIG. 17A.

In some embodiments, first optical ferrule 1700 a is adapted to mate with the second optical ferrule 1700 b along each of the length and thickness dimensions 1759 and 1769 of the optical ferrule 1700 a. In other words, first and second optical ferrules 1700 a and 1700 b can approach the mated position shown in FIG. 17A by moving the ferrules together along the thickness dimension 1769 (e.g., moving the optical ferrules 1700 a and 1700 b from the configuration of FIG. 17C to the configuration shown in FIG. 17A along the thickness dimension 1769) and/or by moving the ferrules together along the length dimension 1759 (e.g., moving the optical ferrules 1700 a and 1700 b from the configuration of FIG. 17B to the configuration shown in FIG. 17A along the length dimension 1759). The first and second optical ferrules 1700 a and 1700 b can also approach the mated position shown in FIG. 17A by moving the ferrules together along a direction intermediate between a direction of the thickness dimension 1769 and a direction of the length dimension 1759. When mated, the first optical ferrule 1700 a is adapted to unmate from the second optical ferrule 1700 b via movement of the first optical ferrule 1700 a relative to the second optical ferrule 1700 b along orthogonal first and second dimensions. For example, the optical ferrules 1700 a and 1700 b in the mated configuration shown in FIG. 17A can be separated along the length dimension 1759 resulting in the separated configuration shown in FIG. 17B or the optical ferrules 1700 a and 1700 b can be separated along the thickness dimension 1769 resulting in the separated configuration shown in FIG. 17C. The first and second optical ferrules 1700 a and 1700 b can also be separated from the mated position shown in FIG. 17A by moving the ferrules apart along a direction intermediate between a direction along the thickness dimension 1769 and a direction along the length dimension 1759. The first optical ferrule 1700 a includes first and second alignment features 1701 a and 1711 a and the second optical ferrule 1700 b includes first and second alignment features 1701 b and 1711 b. The first alignment feature 1701 a of the first optical ferrule 1700 a is adapted to contact a corresponding alignment feature (second alignment feature 1711 b) of the second optical ferrule 1700 b at a first contact region 1781 a of the first alignment feature 1701 a, and the second alignment feature 1711 a of the first optical ferrule 1700 a is adapted to contact a corresponding alignment feature (first alignment feature 1701 b) of the second optical ferrule 1700 b at a second contact region 1783 a of the second alignment feature 1711 a. In some embodiments, the first and second contact regions 1781 a and 1783 a are offset relative to one another along at least the length and thickness dimensions 1759 and 1769 of the optical ferrule 1700 a.

FIGS. 18A and 18B are top and bottom perspective views, respectively, of optical ferrule 1800 which includes first and second alignment features 1801 and 1811. Optical ferrule 1800 includes a waveguide alignment member 1852 and light redirecting member 1855 which may correspond to any waveguide alignment members and light redirecting members, respectively, described elsewhere herein. Optical ferrule includes an optical window 1895, e.g., a recessed optical window, opposite the light redirecting member 1855. Optical window 1895 may be coated with an antireflective coating.

The first alignment feature 1801 of the optical ferrule 1800 is adapted to contact a corresponding alignment feature (which may have the size and shape of second alignment feature 1811) of a mating optical ferrule. Similarly, the second alignment feature 1811 of the optical ferrule 1800 is adapted to contact a corresponding alignment feature (which may have the size and shape of first alignment feature 1801) of a mating optical ferrule. First alignment feature 1801 contacts the corresponding alignment feature of the mating optical ferrule at a first contact region 1881, and second alignment feature 1811 contacts the corresponding alignment feature of the mating optical ferrule at a second contact region 1883. The first and second contact regions 1881 and 1883 are offset relative to one another along at least first and second axes 1859 and 1869 which are along a length dimension and a thickness dimension, respectively, of optical ferrule 1800. The first and second alignment features 1801 and 1811 are located at substantially different locations along the length dimension.

The optical ferrule 1800 may be adapted to mate with a mating optical ferrule along both the length and the thickness dimensions. This is illustrated in FIGS. 18C-18D which are perspective views of optical ferrule 1800 a and mating optical ferrule 1800 b, each of which may correspond to optical ferrule 1800. In FIG. 18C, the optical ferrule 1800 a and the mating optical ferrule 1800 b are separated along axis 1859 which is along a length dimension of the optical ferrule 1800 a and the mating optical ferrule 1800 b. The optical ferrule 1800 a and the mating optical ferrule 1800 b can be mated along the first mating direction 1889-1, which is parallel to the axis 1859, by movement of the optical ferrule 1800 a and the mating optical ferrule 1800 b together along the first mating direction 1889-1. In FIG. 18D, the optical ferrule 1800 a and the mating optical ferrule 1800 b are separated along axis 1869 which is along a thickness dimension of the optical ferrule 1800 a and the mating optical ferrule 1800 b. The optical ferrule 1800 a and the mating optical ferrule 1800 b can be mated along the second mating direction 1889-2, which is parallel to the axis 1869, by movement of the optical ferrule 1800 a and the mating optical ferrule 1800 b together along the second mating direction 1889-2. Similarly, once the optical ferrule 1800 a and the mating optical ferrule 1800 b are mated, the ferrules can be unmated by movement of the ferrules apart from one another along either of the orthogonal first and second mating directions 1889-1 and 1889-2.

FIG. 24A is a top perspective view of first optical ferrule 2400 a, and FIG. 24B is a perspective view of first and second optical ferrules 2400 a and 2400 b, which may be substantially identical hermaphroditic ferrules. Optical ferrule 2400 a includes body 2410, first alignment feature 2401 a, forward stops 2421 a and 2423 a (see FIG. 24B), waveguide alignment member 2452, light redirecting member 2455, and a second alignment feature (not illustrated). First alignment feature 2401 a includes spaced apart first and second portions 2420 and 2430 and central portion 2425. First axis 2459 is along a length dimension of the first optical ferrule 2400 a and second axis 2469 is along a thickness dimension of the first optical ferrule 2400 a. First and second portions 2420 and 2430 extend further away from the body 2410 of the first optical ferrule 2400 a along a first mating direction (direction along first axis 2459) than the central portion 2425. Second optical ferrule 2400 b includes first alignment feature 2401 b, second alignment feature 2411 b, forward stops 2421 b and 2423 b, and optical window 2495 b. The first and second alignment features 2401 b and 2411 b are located at substantially different locations along the first mating direction.

When the first and second optical ferrules 2400 a and 2400 b are mated, the first and second alignment features of each optical ferrule may substantially simultaneously engage corresponding alignment features of the other optical ferrule. In some embodiments, the first and second optical ferrules 2400 a and 2400 b are adapted to mate and/or unmate along each of the thickness and length dimensions of the optical ferrules. When the first and second optical ferrules 2400 a and 2400 b are mated, the first alignment feature 2401 a may contact the second alignment feature 2411 b at a first contact region of the first alignment feature 2401 a, and the second alignment feature of the first optical ferrule 2400 a may contact the first alignment feature 2401 b at a second contact region of the second alignment feature of the first optical ferrule 2401 a. The first and second contact regions may be offset relative to one another along at least the length and thickness dimensions of the optical ferrules.

In some embodiments, an optical ferrule may include a first alignment feature that is made from a material substantially more elastic than the main body of the optical ferrule so that the first alignment feature is compressible. Alternatively, first alignment feature can be made compressible by including slits or other openings such that the first alignment feature can be compressed. Similarly, an optical ferrule may include a second alignment feature that may be made expandable by utilizing a substantially more elastic (compared to the body of the optical ferrule) material to form the second alignment feature, or the second alignment feature may be made expandable by including slits or openings in regions of the optical ferrule proximate an opening defined by the second alignment feature.

In some embodiments, an optical ferrule may include a first alignment feature having a contact region for contacting an alignment feature of a mating optical ferrule, and the first alignment feature may include one or more elastomeric layers adjacent the contact region that allows the first alignment feature to be compressible. In some embodiments, an optical ferrule may include a second alignment feature having a contact region for contacting an alignment feature of a mating optical ferrule, and the second alignment feature may include one or more elastomeric layers adjacent the contact region that allows the second alignment feature to be expandable. The elastomeric layer(s) may be elastomeric pads or elastomeric coatings and may be, for example, silicone layer(s) and/or porous elastomer layer(s).

FIG. 19 is a schematic top view of ferrule 1900 including first and second alignment features 1901 and 1911. Second alignment feature 1911 includes an expandable opening 1913, a first compliant feature 1920 disposed on a first side 1917 of the expandable opening 1913, and a second compliant feature 1930 disposed on a second side 1919 of the opening 1913. Opening 1913 is expandable, at least in part, due to the first and second compliant features 1920 and 1930. The first and second compliant features 1920 and 1930 may each be an elastomeric layer (e.g., a silicone or other elastomeric layer). When opening 1913 is in an expanded state, the first and second compliant features 1920 and 1930 may be in a compressed state, and when opening 1913 is in an unexpanded state, the first and second compliant features 1920 and 1930 may be in an uncompressed state.

FIG. 20 is a schematic top view of ferrule 2000 including first and second alignment features 2001 and 2011. Second alignment feature 2011 includes a body 2006 having opposing first and second sides 2017 and 2019, first compliant feature 2020 disposed on first side 2017, and second compliant feature 2030 disposed on second side 2030. Second alignment feature 2011 is compressible, at least in part, due to the first and second compliant features 2020 and 2030. The first and second compliant features 2020 and 2030 may each be an elastomeric layer (e.g., a silicone or other elastomeric layer as described elsewhere herein). When the second alignment feature 2011 is in a compressed state, the first and second compliant features 2020 and 2030 may be in a compressed state, and when the second alignment feature 2011 is in an uncompressed state, the first and second compliant features 2020 and 2030 may be in an uncompressed state.

In some embodiments of the present description, a ferrule includes opposing first and second compliant features. In some cases, this may be desired in order to provide a high degree of alignment accuracy. In other embodiments, the second compliant feature may be omitted.

FIG. 21 is a schematic top view of ferrule 2100 include first and second alignment features 2101 and 2111. Second alignment feature 2111 includes opposing first and second sides 2117 and 2119 and defines an opening 2113 which is expandable, at least in part, due to compliant feature 2120. In the illustrated embodiment, compliant feature 2120 is a flexible arm having a fixed end 2122 attached to first side 2117 and an opposite free end 2124. In other embodiments, the compliant feature may be an elastomeric layer disposed on first side 2117. When opening 2113 is in an expanded state, the compliant feature 2120 may be in a flexed state, and when opening 2113 is in an unexpanded state, the compliant feature 2120 may be in an unflexed state.

FIG. 22 is a schematic top view of ferrule 2200 include first and second alignment features 2201 and 2211. Second alignment feature 2211 includes a body 2206 and a compliant feature 2220. Second alignment feature 2211 is compressible, at least in part, due to compliant feature 2220. In the illustrated embodiment, compliant feature 2220 is a flexible arm having a fixed end 2222 attached to a side 2117 of the body 2206 and an opposite free end 2224. In other embodiments, the compliant feature may be an elastomeric layer disposed on the side 2117. When the second alignment feature 2211 is in a compressed state, the compliant feature 2220 may be in a flexed state, and when the second alignment feature 2211 is in an uncompressed state, the compliant feature 2220 may be in an unflexed state.

FIG. 23 is a schematic top view of ferrule assembly 2305 including first and second optical ferrules 2300 a and 2300 b. First optical ferrule 2300 a is adapted to receive light from the plurality of optical fibers 2346 a and transmit light to the second optical ferrule 2300 b which is adapted to receive light from first optical ferrule 2300 a and transmit light to the plurality of optical fibers 2346 b. The ferrule assembly 2305 may also operate in reverse of this, receiving light from the plurality of optical fibers 2346 b and transmitting light to the plurality of optical fibers 2346 a. First optical ferrule 2300 a includes forward stops 2321 a and 2323 a, mating portion 2313 a, and compliant feature 2320 a, which in the illustrated embodiment is a flexible arm, which can flex away from a body of the optical ferrule 2300 a during mating and which has a free end 2324 a and an opposite fixed end 2322 a attached to a side of the body of the optical ferrule 2300 a. Similarly, second optical ferrule 2300 b includes forward stops 2321 b and 2323 b and includes compliant feature 2320 b, which in the illustrated embodiment is a flexible arm. When the first and second optical ferrules 2300 a and 2300 b are fully mated, the forward stops 2321 a and 2323 a contact the forward stops 2321 b and 2323 b, respectively; the mating portion 2313 a is stacked with a corresponding mating portion of the second optical ferrule 2300 b in a direction (y-direction) orthogonal to the mating direction; the free end 2324 a of the compliant feature 2320 a contacts a side of a body of the second optical ferrule 2300 b; and a corresponding free end of a compliant feature of the second optical ferrule 2300 b contacts a side of a body of the first optical ferrule 2300 a. Any of the connector housings, ferrules, alignment frames or other components may be unitary components made by molding. For example, any of ferrule 400, ferrule 500 a, ferrule 1000 a, ferrule 1600 a, ferrule 1800, alignment frames 760 or 860, and/or housing 242 may be unitary components made by injection molding. Accordingly, any of the components may comprise an injection molded polymer. In some embodiments, a connector housing, a ferrule, or an alignment frame may be made by molding two or more parts (e.g., two halves of a connector housing) and assembling the parts with a permanent adhesive, for example.

Methods of molding a unitary optical ferrule, for example, are described in co-pending application entitled “Optical Ferrule and Optical Ferrule Mold” (Provisional Application No. 62/239,996) filed on an even date herewith and hereby incorporated herein to the extent that it does not contradict the present description.

The material forming the compliant features and/or the geometry of the compliant features can be selected to provide a desired alignment force between ferrules. For example, the alignment force provided by the compliant features can be increased or decreased by choosing a material for the compliant features with a higher or lower Young's modulus, respectively. As another example, in embodiments utilizing flexible arms, the alignment force provided by the flexible arms can be increased or decreased by choosing larger or smaller cross-sectional areas, respectively, for the flexible arms. Useful alignment forces can be obtained by choosing an injection moldable polymer for both a body of the ferrule and the compliant features of the ferrule and by choosing a geometry of the compliant features that can be injection molded along with the body of the ferrule. In this way, for example, a unitary ferrule having compliant features that provide a desired alignment force can be made.

The following is a list of exemplary embodiments of the present description.

Embodiment 1 is an optical ferrule comprising first and second alignment features for mating with corresponding alignment features of a mating optical ferrule, one of the first and second alignment features being compressible or expandable, the optical ferrule adapted to receive and transmit light. Embodiment 2 is the optical ferrule of embodiment 1, wherein one of the first and second alignment features is expandable. Embodiment 3 is the optical ferrule of embodiment 1, wherein one of the first and second alignment features is compressible. Embodiment 4 is the optical ferrule of embodiment 3, wherein the other of the first and second alignment features defines an opening. Embodiment 5 is the optical ferrule of embodiment 1, wherein the first alignment feature defines an opening having a size and a shape and the second alignment feature is compressible. Embodiment 6 is the optical ferrule of embodiment 5, wherein the second alignment feature has an uncompressed state and a compressed state, such that inserting the compressible second alignment feature into an opening of an object, the opening of the object having the size and shape of the opening of the first alignment feature, compresses the second alignment feature from the uncompressed state to the compressed state. Embodiment 7 is the optical ferrule of embodiment 6, wherein the second alignment feature comprises a first compliant feature. Embodiment 8 is the optical ferrule of embodiment 7, wherein the first compliant feature comprises a flexible arm having a fixed end attached to a side of a body of the second alignment feature and an opposite free end. Embodiment 9 is the optical ferrule of embodiment 7, wherein the second alignment feature further comprises a second compliant feature. Embodiment 10 is the optical ferrule of embodiment 9, wherein the first compliant feature comprises a first flexible arm having a first fixed end attached to a first side of a body of the second alignment feature and an opposite first free end; and the second compliant feature comprises a second flexible arm having a second fixed end attached to a second side of the body, opposite the first side, and an opposite second free end, such that when the second alignment feature is in the compressed state, the first and second free ends are separated by a first distance and when the second alignment feature is in the uncompressed state, the first and second free ends are separated by a second distance greater than the first distance. Embodiment 11 is the optical ferrule of embodiment 7, wherein the first compliant feature comprises a first elastomeric layer disposed on a first side of a body of the second alignment feature. Embodiment 12 is the optical ferrule of embodiment 11, wherein the second alignment feature further comprises a second compliant feature. Embodiment 13 is the optical ferrule of embodiment 12, wherein the second compliant feature comprises a second elastomeric layer disposed on a second side of the body of the second alignment feature opposite the first side. Embodiment 14 is the optical ferrule of embodiment 1, wherein the first alignment feature has a size and a shape and the second alignment feature defines an expandable opening. Embodiment 15 is the optical ferrule of embodiment 14, wherein the expandable opening has an unexpanded state and an expanded state, such that inserting an object having the size and the shape of the first alignment feature into the expandable opening expands the opening from the unexpanded state to the expanded state. Embodiment 16 is the optical ferrule of embodiment 15, wherein the second alignment feature comprises a first compliant feature. Embodiment 17 is the optical ferrule of embodiment 16, wherein the first compliant feature comprises a flexible arm having a fixed end attached to a side of a side of the expandable opening and an opposite free end. Embodiment 18 is the optical ferrule of embodiment 16, wherein the second alignment feature further comprises a second compliant feature. Embodiment 19 is the optical ferrule of embodiment 18, wherein the first compliant feature comprises a first flexible arm having a first fixed end attached to a first side of the expandable opening and an opposite first free end, and the second compliant feature comprises a second flexible arm having a second fixed end attached to a second side of the expandable opening, opposite the first side, and an opposite second free end, such that when the expandable opening is in the unexpanded state, the first and second free ends are separated by a first distance and when the expandable opening is in the expanded state, the first and second free ends are separated by a second distance greater than the first distance. Embodiment 20 is the optical ferrule of embodiment 16, wherein the first compliant feature comprises a first elastomeric layer disposed on a first side of the expandable opening. Embodiment 21 is the optical ferrule of embodiment 20, wherein the second alignment feature further comprises a second compliant feature. Embodiment 22 is the optical ferrule of embodiment 21, wherein the second compliant feature comprises a second elastomeric layer disposed on a second side of the expandable opening opposite the first side. Embodiment 23 the optical ferrule of embodiment 1, wherein the first alignment feature is located at a first location along a ferrule mating direction of the optical ferrule, and the second alignment feature is located at a substantially different second location along the ferrule mating direction, such that when the optical ferrule is mated with the mating optical ferrule along the ferrule mating direction, the first and second alignment features substantially simultaneously engage the corresponding alignment features of the mating optical ferrule. Embodiment 24 is the optical ferrule of embodiment 23, wherein the first location is at a front of the optical ferrule and the second location is at a rear of the optical ferrule. Embodiment 25 is the optical ferrule of embodiment 1, wherein the optical ferrule has a length direction and a thickness direction, the optical ferrule adapted to mate with the mating optical ferrule along the length direction of the optical ferrule, the first alignment feature adapted to contact a corresponding first alignment feature of the mating optical ferrule at a first contact region of the first alignment feature, the second alignment feature adapted to contact a corresponding second alignment feature of the mating optical ferrule at a second contact region of the second alignment feature, the first and second contact regions being offset relative to one another along at least the length and thickness directions of the optical ferrule. Embodiment 26 is the optical ferrule of embodiment 25, further comprising at least one light redirecting element for receiving light along the length direction of the optical ferrule and redirecting the received light along the thickness direction of the optical ferrule. Embodiment 27 is the optical ferrule of embodiment 1, further comprising at least one light redirecting element for receiving light along a length direction of the optical ferrule and redirecting the received light along a thickness direction of the optical ferrule. Embodiment 28 is the optical ferrule of embodiment 1, wherein the optical ferrule is adapted to mate with the mating optical ferrule along each of two orthogonal dimensions of the optical ferrule. Embodiment 29 is the optical ferrule of embodiment 28, wherein the two orthogonal dimensions are length and thickness dimensions of the optical ferrule. Embodiment 30 is the optical ferrule of embodiment 1, wherein when the optical ferrule is mated with a second optical ferrule of embodiment 1 along a mating direction, the first and second alignment features are adapted provide a restoring force along the mating direction when the optical ferrule and the second optical ferrule are moved apart along the mating direction. Embodiment 31 is the optical ferrule of embodiment 1 being hermaphroditic. Embodiment 32 is the optical ferrule of embodiment 1 being unitary. Embodiment 33 is a connector comprising a housing and the optical ferrule of embodiment 1 disposed at least partially inside the housing. Embodiment 34 is an optical ferrule comprising:

-   a first feature having a size and a shape; and -   a second feature defining an expandable opening, the expandable     opening having an unexpanded state and an expanded state, such that     inserting an object having the size and the shape of the first     feature into the expandable opening expands the opening from the     unexpanded state to the expanded state, the optical ferrule adapted     to receive and transmit light.     Embodiment 35 is the optical ferrule of embodiment 34, wherein the     first and second features are alignment features for engaging     corresponding alignment features of a mating optical ferrule.     Embodiment 36 is the optical ferrule of embodiment 35, wherein the     second feature comprises a first compliant feature.     Embodiment 37 is the optical ferrule of embodiment 36, the first     compliant feature comprises a flexible arm having a fixed end     attached to a side of a side of the expandable opening and an     opposite free end.     Embodiment 38 is the optical ferrule of embodiment 36, wherein the     second feature further comprises a second compliant feature.     Embodiment 39 is the optical ferrule of embodiment 38, wherein the     first compliant feature comprises a first flexible arm having a     first fixed end attached to a first side of the expandable opening     and an opposite first free end, and the second compliant feature     comprises a second flexible arm having a second fixed end attached     to a second side of the expandable opening, opposite the first side,     and an opposite second free end, such that when the expandable     opening is in the unexpanded state, the first and second free ends     are separated by a first distance and when the expandable opening is     in the expanded state, the first and second free ends are separated     by a second distance greater than the first distance.     Embodiment 40 is the optical ferrule of embodiment 36, wherein the     first compliant feature comprises a first elastomeric layer disposed     on a first side of the expandable opening.     Embodiment 41 is the optical ferrule of embodiment 40, wherein the     second feature further comprises a second compliant feature.     Embodiment 42 is the optical ferrule of embodiment 41, wherein the     second compliant feature comprises a second elastomeric layer     disposed on a second side of the expandable opening opposite the     first side.     Embodiment 43 is the optical ferrule of embodiment 34, wherein the     first feature is located at a first location along a ferrule mating     direction of the optical ferrule, and the second feature is located     at a substantially different second location along the ferrule     mating direction, such that when the optical ferrule is mated with a     mating optical ferrule along the ferrule mating direction, the first     and second features substantially simultaneously engage     corresponding features of the mating optical ferrule.     Embodiment 44 is the optical ferrule of embodiment 43, wherein the     first location is at a front of the optical ferrule and the second     location is at a rear of the optical ferrule.     Embodiment 45 is the optical ferrule of embodiment 34, wherein the     optical ferrule has a length direction and a thickness direction,     the optical ferrule adapted to mate with a mating optical ferrule     along the length direction of the optical ferrule, the first feature     adapted to contact a corresponding first feature of the mating     optical ferrule at a first contact region of the first alignment     feature, the second feature adapted to contact a corresponding     second feature of the mating optical ferrule at a second contact     region of the second feature, the first and second contact regions     being offset relative to one another along at least the length and     thickness directions of the optical ferrule.     Embodiment 46 is the optical ferrule of embodiment 45, further     comprising at least one light redirecting element for receiving     light along the length direction of the optical ferrule and     redirecting the received light along the thickness direction of the     optical ferrule.     Embodiment 47 is the optical ferrule of embodiment 34, further     comprising at least one light redirecting element for receiving     light along a length direction of the optical ferrule and     redirecting the received light along a thickness direction of the     optical ferrule.     Embodiment 48 is the optical ferrule of embodiment 34, wherein the     optical ferrule is adapted to mate with a mating optical ferrule     along each of two orthogonal dimensions of the optical ferrule.     Embodiment 49 is the optical ferrule of embodiment 48, wherein the     two orthogonal dimensions are length and thickness dimensions of the     optical ferrule.     Embodiment 50 is the optical ferrule of embodiment 34, wherein when     the optical ferrule is mated with a second optical ferrule of     embodiment 34 along a mating direction, the first and second     features are adapted provide a restoring force along the mating     direction when the optical ferrule and the second optical ferrule     are moved apart along the mating direction.     Embodiment 51 is the optical ferrule of embodiment 34 being     hermaphroditic.     Embodiment 52 is the optical ferrule of embodiment 34 being unitary.     Embodiment 53 is a connector comprising a housing and the optical     ferrule of embodiment 34 disposed at least partially inside the     housing.     Embodiment 54 is an optical ferrule comprising: -   a first feature defining an opening, the opening having a size and a     shape; and -   a compressible second feature having an uncompressed state and a     compressed state, such that inserting the compressible second     feature into an opening of an object, the opening of the object     having the size and shape of the opening of the first feature,     compresses the second feature from the uncompressed state to the     compressed state, the optical ferrule adapted to receive and     transmit light.     Embodiment 55 is the optical ferrule of embodiment 54, wherein the     first and second features are alignment features for engaging     corresponding alignment features of a mating optical ferrule.     Embodiment 56 is the optical ferrule of embodiment 54, wherein the     first feature is located at a first location along a ferrule mating     direction of the optical ferrule, and the second feature is located     at a substantially different second location along the ferrule     mating direction, such that when the optical ferrule is mated with a     mating optical ferrule along the ferrule mating direction, the first     and second features substantially simultaneously engage     corresponding features of the mating optical ferrule.     Embodiment 57 is the optical ferrule of embodiment 56, wherein the     first location is at a front of the optical ferrule and the second     location is at a rear of the optical ferrule.     Embodiment 58 is the optical ferrule of embodiment 54, wherein the     optical ferrule has a length direction and a thickness direction,     the optical ferrule adapted to mate with a mating optical ferrule     along the length direction of the optical ferrule, the first feature     adapted to contact a corresponding first feature of the mating     optical ferrule at a first contact region of the first feature, the     second feature adapted to contact a corresponding second feature of     the mating optical ferrule at a second contact region of the second     feature, the first and second contact regions being offset relative     to one another along at least the length and thickness directions of     the optical ferrule.     Embodiment 59 is the optical ferrule of embodiment 58, further     comprising at least one light redirecting element for receiving     light along the length direction of the optical ferrule and     redirecting the received light along the thickness direction of the     optical ferrule.     Embodiment 60 is the optical ferrule of embodiment 54, further     comprising at least one light redirecting element for receiving     light along a length direction of the optical ferrule and     redirecting the received light along a thickness direction of the     optical ferrule.     Embodiment 61 is the optical ferrule of embodiment 54, wherein the     optical ferrule is adapted to mate with a mating optical ferrule     along each of two orthogonal dimensions of the optical ferrule.     Embodiment 62 is the optical ferrule of embodiment 54, wherein the     two orthogonal dimensions are length and thickness dimensions of the     optical ferrule.     Embodiment 63 is the optical ferrule of embodiment 54, wherein the     second feature comprises a first compliant feature.     Embodiment 64 is the optical ferrule of embodiment 63, wherein the     first compliant feature comprises a flexible arm having a fixed end     attached to a side of a body of the second alignment feature and an     opposite free end.     Embodiment 65 is the optical ferrule of embodiment 63, wherein the     second alignment feature further comprises a second compliant     feature.     Embodiment 66 is the optical ferrule of embodiment 65, wherein the     first compliant feature comprises a first flexible arm having a     first fixed end attached to a first side of a body of the second     feature and an opposite first free end; and the second compliant     feature comprises a second flexible arm having a second fixed end     attached to a second side of the body, opposite the first side, and     an opposite second free end, such that when the second feature is in     the compressed state, the first and second free ends are separated     by a first distance and when the second feature is in the     uncompressed state, the first and second free ends are separated by     a second distance greater than the first distance.     Embodiment 67 is the optical ferrule of embodiment 63, wherein the     first compliant feature comprises a first elastomeric layer disposed     on a first side of a body of the second alignment feature.     Embodiment 68 is the optical ferrule of embodiment 67, wherein the     second alignment feature further comprises a second compliant     feature.     Embodiment 69 is the optical ferrule of embodiment 68, wherein the     second compliant feature comprises a second elastomeric layer     disposed on a second side of the body of the second alignment     feature opposite the first side.     Embodiment 70 is the optical ferrule of embodiment 54, wherein when     the optical ferrule is mated with a second optical ferrule of     embodiment 54 along a mating direction, the first and second     features are adapted provide a restoring force along the mating     direction when the optical ferrule and the second optical ferrule     are moved apart along the mating direction.     Embodiment 71 is the optical ferrule of embodiment 54 being     hermaphroditic.     Embodiment 72 is the optical ferrule of embodiment 54 being unitary.     Embodiment 73 is a connector comprising a housing and the optical     ferrule of embodiment 54 disposed at least partially inside the     housing.     Embodiment 74 is an optical ferrule adapted to mate with a mating     optical ferrule along a ferrule mating direction, the optical     ferrule comprising: -   a first alignment feature for engaging a corresponding first     alignment feature of a mating optical ferrule, the first alignment     feature located at a first location along the ferrule mating     direction; and -   a second alignment feature for engaging a corresponding second     alignment feature of the mating optical ferrule, the second     alignment feature located at a substantially different second     location along the ferrule mating direction, such that when the     optical ferrule is mated with the mating optical ferrule along the     ferrule mating direction, the first and second alignment features     substantially simultaneously engage the corresponding first and     second alignment features of the mating optical ferrule, the optical     ferrule adapted to receive and transmit light.     Embodiment 75 is the optical ferrule of embodiment 74, wherein the     first location is at a front of the optical ferrule and the second     location is at a rear of the optical ferrule.     Embodiment 76 is the optical ferrule of embodiment 74, wherein the     first alignment feature comprises spaced apart first and second     portions and a central portion between the first and second     portions, the first and second portions extending further from a     body of the optical ferrule along the ferrule mating direction than     the central portion.     Embodiment 77 is the optical ferrule of embodiment 74, wherein one     of the first and second alignment features of the optical ferrule is     expandable.     Embodiment 78 is the optical ferrule of embodiment 74, wherein one     of the first and second alignment features of the optical ferrule is     compressible.     Embodiment 79 is the optical ferrule of embodiment 78, wherein the     other of the first and second alignment features of the optical     ferrule defines an opening.     Embodiment 80 is the optical ferrule of embodiment 74, wherein the     first alignment feature of the optical ferrule defines an opening     having a size and a shape and the second alignment feature of the     optical ferrule is compressible.     Embodiment 81 is the optical ferrule of embodiment 80, wherein the     second alignment feature of the optical ferrule has an uncompressed     state and a compressed state, such that inserting the compressible     second alignment feature of the optical ferrule into an opening of     an object, the opening of the object having the size and shape of     the opening of the first alignment feature of the optical ferrule,     compresses the second alignment feature of the optical ferrule from     the uncompressed state to the compressed state.     Embodiment 82 is the optical ferrule of embodiment 81, wherein the     second alignment feature of the optical ferrule comprises a first     compliant feature.     Embodiment 83 is the optical ferrule of embodiment 82, wherein the     first compliant feature is an elastomeric layer disposed on a side     of a body of the second alignment feature.     Embodiment 84 is the optical ferrule of embodiment 82, wherein the     first compliant feature comprises a flexible arm having a free end     and an opposite fixed end attached to a side of a body of the second     alignment feature.     Embodiment 85 is the optical ferrule of embodiment 82, wherein the     second alignment feature further comprises a second compliant     feature.     Embodiment 86 is the optical ferrule of embodiment 85, wherein the     first compliant feature is a first elastomeric layer disposed on a     first side of a body of the second alignment feature and the second     compliant feature is a second elastomeric layer disposed on a     different second side of the body.     Embodiment 87 is the optical ferrule of embodiment 85, wherein the     first compliant feature comprises a first flexible arm having a     first fixed end attached to a first side of a body of the second     alignment feature of the optical ferrule and an opposite first free     end; and the second compliant feature comprises a second flexible     arm having a second fixed end attached to a second side of the body,     opposite the first side, and an opposite second free end, such that     when the second alignment feature of the optical ferrule is in the     compressed state, the first and second free ends are separated by a     first distance and when the second alignment feature is in the     uncompressed state, the first and second free ends are separated by     a second distance greater than the first distance.     Embodiment 88 is the optical ferrule of embodiment 74, wherein the     first alignment feature of the optical ferrule has a size and a     shape and the second alignment feature of the optical ferrule     defines an expandable opening.     Embodiment 89 is the optical ferrule of embodiment 88, wherein the     expandable opening has an unexpanded state and an expanded state,     such that inserting an object having the size and the shape of the     first alignment feature of the optical ferrule into the expandable     opening expands the opening from the unexpanded state to the     expanded state.     Embodiment 90 is the optical ferrule of embodiment 89, wherein the     second alignment feature of the optical ferrule comprises a first     compliant feature.     Embodiment 91 is the optical ferrule of embodiment 90, wherein the     first compliant feature comprises a first elastomeric layer disposed     on a first side of the expandable opening.     Embodiment 92 is the optical ferrule of embodiment 90, wherein the     first compliant feature comprises a first flexible arm having a     first fixed end attached to a first side of the expandable opening     and an opposite first free end.     Embodiment 93 is the optical ferrule of embodiment 90, wherein the     second alignment feature further comprises a second compliant     feature.     Embodiment 94 is the optical ferrule of embodiment 93, wherein the     first compliant feature is a first elastomeric layer disposed on a     first side of the expandable opening and the second compliant     feature is a second elastomeric layer disposed on a different second     side of the expandable opening.     Embodiment 95 is the optical ferrule of embodiment 93, wherein the     first compliant feature comprises a first flexible arm having a     first fixed end attached to a first side of the expandable opening     and an opposite first free end, and the second compliant feature     comprises a second flexible arm having a second fixed end attached     to a second side of the expandable opening, opposite the first side,     and an opposite second free end, such that when the expandable     opening is in the unexpanded state, the first and second free ends     are separated by a first distance and when the expandable opening is     in the expanded state, the first and second free ends are separated     by a second distance greater than the first distance.     Embodiment 96 is the optical ferrule of embodiment 74, wherein the     optical ferrule has a length direction and a thickness direction,     the ferrule mating direction being along the length direction of the     optical ferrule, the first alignment feature of the optical ferrule     adapted to contact the corresponding first alignment feature of the     mating optical ferrule at a first contact region of the first     alignment feature of the optical ferrule, the second alignment     feature of the optical ferrule adapted to contact the corresponding     second alignment feature of the mating optical ferrule at a second     contact region of the second alignment feature of the optical     ferrule, the first and second contact regions being offset relative     to one another along at least the length and thickness directions of     the optical ferrule.     Embodiment 97 is the optical ferrule of embodiment 96, further     comprising at least one light redirecting element for receiving     light along the length direction of the optical ferrule and     redirecting the received light along the thickness direction of the     optical ferrule.     Embodiment 98 is the optical ferrule of embodiment 74, further     comprising at least one light redirecting element for receiving     light along a length direction of the optical ferrule and     redirecting the received light along a thickness direction of the     optical ferrule.     Embodiment 99 is the optical ferrule of embodiment 74, wherein the     optical ferrule is adapted to mate with the mating optical ferrule     along each of two orthogonal dimensions of the optical ferrule.     Embodiment 100 is the optical ferrule of embodiment 99, wherein the     two orthogonal dimensions are length and thickness dimensions of the     optical ferrule.     Embodiment 101 is the optical ferrule of embodiment 74, wherein when     the optical ferrule is mated with a second optical ferrule of     embodiment 74 along the ferrule mating direction, the first and     second alignment features are adapted provide a restoring force     along the ferrule mating direction when the optical ferrule and the     second optical ferrule are moved apart along the ferrule mating     direction.     Embodiment 102 is the optical ferrule of embodiment 74 being     hermaphroditic.     Embodiment 103 is the optical ferrule of embodiment 74 being     unitary.     Embodiment 104 is a connector comprising a housing and the optical     ferrule of embodiment 74 disposed at least partially inside the     housing.     Embodiment 105 is an optical ferrule adapted to mate with a mating     optical ferrule along a length direction of the optical ferrule, the     optical ferrule comprising: -   a thickness along a thickness direction of the optical ferrule; -   a first alignment feature for contacting a corresponding first     alignment feature of a mating optical ferrule at a first contact     region of the first alignment feature; and -   a second alignment feature for contacting a corresponding second     alignment feature of the mating optical ferrule at a second contact     region of the second alignment feature, the first and second contact     regions being offset relative to one another along at least the     length and thickness directions of the optical ferrule.     Embodiment 106 is the optical ferrule of embodiment 105, wherein the     first alignment feature comprises spaced apart first and second     portions and a central portion between the first and second     portions, the first and second portions extending further from a     body of the optical ferrule along the length direction than the     central portion.     Embodiment 107 is the optical ferrule of embodiment 105 further     comprising at least one light redirecting element for receiving     light along the length direction of the optical ferrule and     redirecting the received light along the thickness direction of the     optical ferrule.     Embodiment 108 is the optical ferrule of embodiment 105, wherein the     first alignment feature of the optical ferrule is disposed at a     front of the optical ferrule and the second alignment feature of the     optical ferrule is disposed at a rear of the optical ferrule.     Embodiment 109 is the optical ferrule of embodiment 105, wherein one     of the first and second alignment features of the optical ferrule is     expandable.     Embodiment 110 is the optical ferrule of embodiment 105, wherein one     of the first and second alignment features of the optical ferrule is     compressible.     Embodiment 111 is the optical ferrule of embodiment 110, wherein the     other of the first and second alignment features of the optical     ferrule defines an opening.     Embodiment 112 is the optical ferrule of embodiment 105, wherein the     first alignment feature of the optical ferrule defines an opening     having a size and a shape and the second alignment feature of the     optical ferrule is compressible.     Embodiment 113 is the optical ferrule of embodiment 112, wherein the     second alignment feature of the optical ferrule has an uncompressed     state and a compressed state, such that inserting the compressible     second alignment feature of the optical ferrule into an opening of     an object, the opening of the object having the size and shape of     the opening of the first alignment feature of the optical ferrule,     compresses the second alignment feature of the optical ferrule from     the uncompressed state to the compressed state.     Embodiment 114 is the optical ferrule of embodiment 113, wherein the     second alignment feature of the optical ferrule comprises a first     compliant feature.     Embodiment 115 is the optical ferrule of embodiment 114, wherein the     first compliant feature is an elastomeric layer disposed on a side     of a body of the second alignment feature.     Embodiment 116 is the optical ferrule of embodiment 114, wherein the     first compliant feature comprises a flexible arm having a free end     and an opposite fixed end attached to a side of a body of the second     alignment feature.     Embodiment 117 is the optical ferrule of embodiment 114, wherein the     second alignment feature further comprises a second compliant     feature.     Embodiment 118 is the optical ferrule of embodiment 117, wherein the     first compliant feature is a first elastomeric layer disposed on a     first side of a body of the second alignment feature and the second     compliant feature is a second elastomeric layer disposed on a     different second side of the body.     Embodiment 119 is the optical ferrule of embodiment 117, wherein the     first compliant feature comprises a first flexible arm having a     first fixed end attached to a first side of a body of the second     alignment feature of the optical ferrule and an opposite first free     end; and the second compliant feature comprises a second flexible     arm having a second fixed end attached to a second side of the body,     opposite the first side, and an opposite second free end, such that     when the second alignment feature of the optical ferrule is in the     compressed state, the first and second free ends are separated by a     first distance and when the second alignment feature is in the     uncompressed state, the first and second free ends are separated by     a second distance greater than the first distance.     Embodiment 120 is the optical ferrule of embodiment 105, wherein the     first alignment feature of the optical ferrule has a size and a     shape and the second alignment feature of the optical ferrule     defines an expandable opening.     Embodiment 121 is the optical ferrule of embodiment 120, wherein the     expandable opening has an unexpanded state and an expanded state,     such that inserting an object having the size and the shape of the     first alignment feature of the optical ferrule into the expandable     opening expands the opening from the unexpanded state to the     expanded state.     Embodiment 122 is the optical ferrule of embodiment 121, wherein the     second alignment feature of the optical ferrule comprises a first     compliant feature.     Embodiment 123 is the optical ferrule of embodiment 122, wherein the     first compliant feature comprises a first elastomeric layer disposed     on a first side of the expandable opening.     Embodiment 124 is the optical ferrule of embodiment 122, wherein the     first compliant feature comprises a first flexible arm having a     first fixed end attached to a first side of the expandable opening     and an opposite first free end.     Embodiment 125 is the optical ferrule of embodiment 122, wherein the     second alignment feature further comprises a second compliant     feature.     Embodiment 126 is the optical ferrule of embodiment 125, wherein the     first compliant feature is a first elastomeric layer disposed on a     first side of the expandable opening and the second compliant     feature is a second elastomeric layer disposed on a different second     side of the expandable opening.     Embodiment 127 is the optical ferrule of embodiment 125, wherein the     first compliant feature comprises a first flexible arm having a     first fixed end attached to a first side of the expandable opening     and an opposite first free end, and the second compliant feature     comprises a second flexible arm having a second fixed end attached     to a second side of the expandable opening, opposite the first side,     and an opposite second free end, such that when the expandable     opening is in the unexpanded state, the first and second free ends     are separated by a first distance and when the expandable opening is     in the expanded state, the first and second free ends are separated     by a second distance greater than the first distance.     Embodiment 128 is the optical ferrule of embodiment 105, wherein the     first alignment feature of the optical ferrule is adapted to contact     the corresponding first alignment feature of the mating optical     ferrule at a first contact region of the first alignment feature of     the optical ferrule, the second alignment feature of the optical     ferrule is adapted to contact the corresponding second alignment     feature of the mating optical ferrule at a second contact region of     the second alignment feature of the optical ferrule, and the first     and second contact regions are offset relative to one another along     at least the length and thickness directions of the optical ferrule.     Embodiment 129 is the optical ferrule of embodiment 105, wherein the     optical ferrule is adapted to mate with the mating optical ferrule     along each of two orthogonal dimensions of the optical ferrule.     Embodiment 130 is the optical ferrule of embodiment 129, wherein the     two orthogonal dimensions are length and thickness dimensions of the     optical ferrule.     Embodiment 131 is the optical ferrule of embodiment 105, wherein     when the optical ferrule is mated with a second optical ferrule of     embodiment 1 along the length direction, the first and second     alignment features are adapted provide a restoring force along the     length direction when the optical ferrule and the second optical     ferrule are moved apart along the length direction.     Embodiment 132 is the optical ferrule of embodiment 105 being     hermaphroditic.     Embodiment 133 is the optical ferrule of embodiment 105 being     unitary.     Embodiment 134 is a connector comprising a housing and the optical     ferrule of embodiment 105 disposed at least partially inside the     housing.     Embodiment 135 is an optical ferrule comprising first and second     alignment features for engaging corresponding alignment features of     a mating optical ferrule, the optical ferrule adapted to mate with     the mating optical ferrule along each of two orthogonal dimensions     of the optical ferrule.     Embodiment 136 is the optical ferrule of embodiment 135, wherein the     two orthogonal dimensions are length and thickness dimensions of the     optical ferrule.     Embodiment 137 is the optical ferrule of embodiment 136, wherein the     first alignment feature comprises spaced apart first and second     portions and a central portion between the first and second     portions, the first and second portions extending further from a     body of the optical ferrule along the length dimension than the     central portion.     Embodiment 138 is an optical ferrule comprising first and second     alignment features for engaging corresponding alignment features of     a mating optical ferrule, wherein when the optical ferrule is mated     with the mating optical ferrule, the optical ferrule is adapted to     unmate from the mating optical ferrule via movement of the optical     ferrule relative to the mating optical ferrule along a first     dimension of the optical ferrule; and when the optical ferrule is     mated with the mating ferrule, the optical ferrule is adapted to     unmate from the mating ferrule via movement of the optical ferrule     relative to the mating ferrule along a second dimension of the     optical ferrule orthogonal to the first dimension.     Embodiment 139 is the optical ferrule of embodiment 138, wherein the     first dimension is a length dimension of the optical ferrule and the     second dimension is a thickness dimension of the optical ferrule.     Embodiment 140 is the optical ferrule of embodiment 139, wherein the     first alignment feature comprises spaced apart first and second     portions and a central portion between the first and second     portions, the first and second portions extending further from a     body of the optical ferrule along the length dimension than the     central portion.     Embodiment 141 is the optical ferrule of embodiment 135 or 138,     further comprising at least one light redirecting element for     receiving light along a length dimension of the optical ferrule and     redirecting the received light along a thickness dimension of the     optical ferrule.     Embodiment 142 is the optical ferrule of embodiment 135 or 138,     wherein one of the first and second alignment features is     expandable.     Embodiment 143 is the optical ferrule of embodiment 135 or 138,     wherein one of the first and second alignment features is     compressible.     Embodiment 144 is the optical ferrule of embodiment 143, wherein the     other of the first and second alignment features defines an opening.     Embodiment 145 is the optical ferrule of embodiment 135 or 138,     wherein the first alignment feature defines an opening having a size     and a shape and the second alignment feature is compressible.     Embodiment 146 is the optical ferrule of embodiment 145, wherein the     second alignment feature has an uncompressed state and a compressed     state, such that inserting the compressible second feature into an     opening of an object, the opening of the object having the size and     shape of the opening of the first alignment feature, compresses the     second alignment feature from the uncompressed state to the     compressed state.     Embodiment 147 is the optical ferrule of embodiment 146, wherein the     second alignment feature comprises a first compliant feature.     Embodiment 148 is the optical ferrule of embodiment 147, wherein the     first compliant feature is an elastomeric layer disposed on a side     of a body of the second alignment feature.     Embodiment 149 is the optical ferrule of embodiment 147, wherein the     first compliant feature comprises a flexible arm having a free end     and an opposite fixed end attached to a side of a body of the second     alignment feature.     Embodiment 150 is the optical ferrule of embodiment 147, wherein the     second alignment feature further comprises a second compliant     feature.     Embodiment 151 is the optical ferrule of embodiment 150, wherein the     first compliant feature is a first elastomeric layer disposed on a     first side of a body of the second alignment feature and the second     compliant feature is a second elastomeric layer disposed on a     different second side of the body.     Embodiment 152 is the optical ferrule of embodiment 150, wherein the     first compliant feature comprises a first flexible arm having a     first fixed end attached to a first side of a body of the second     alignment feature and an opposite first free end; and the second     compliant feature comprises a second flexible arm having a second     fixed end attached to a second side of the body, opposite the first     side, and an opposite second free end, such that when the second     alignment feature is in the compressed state, the first and second     free ends are separated by a first distance and when the second     alignment feature is in the uncompressed state, the first and second     free ends are separated by a second distance greater than the first     distance.     Embodiment 153 is the optical ferrule of embodiment 135 or 138,     wherein the first alignment feature has a size and a shape and the     second alignment feature defines an expandable opening.     Embodiment 154 is the optical ferrule of embodiment 153, wherein the     expandable opening has an unexpanded state and an expanded state,     such that inserting an object having the size and the shape of the     first alignment feature into the expandable opening expands the     opening from the unexpanded state to the expanded state.     Embodiment 155 is the optical ferrule of embodiment 154, wherein the     second alignment feature comprises a first compliant feature.     Embodiment 156 is the optical ferrule of embodiment 155, wherein the     first compliant feature comprises a first elastomeric layer disposed     on a first side of the expandable opening.     Embodiment 157 is the optical ferrule of embodiment 155, wherein the     first compliant feature comprises a first flexible arm having a     first fixed end attached to a first side of the expandable opening     and an opposite first free end.     Embodiment 158 is the optical ferrule of embodiment 155, wherein the     second alignment feature further comprises a second compliant     feature.     Embodiment 159 is the optical ferrule of embodiment 155, wherein the     first compliant feature is a first elastomeric layer disposed on a     first side of the expandable opening and the second compliant     feature is a second elastomeric layer disposed on a different second     side of the expandable opening.     Embodiment 160 is the optical ferrule of embodiment 159, wherein the     first compliant feature comprises a first flexible arm having a     first fixed end attached to a first side of the expandable opening     and an opposite first free end, and the second compliant feature     comprises a second flexible arm having a second fixed end attached     to a second side of the expandable opening, opposite the first side,     and an opposite second free end, such that when the expandable     opening is in the unexpanded state, the first and second free ends     are separated by a first distance and when the expandable opening is     in the expanded state, the first and second free ends are separated     by a second distance greater than the first distance.     Embodiment 161 is the optical ferrule of embodiment 135 or 138,     wherein the first alignment feature is located at a first location     along a ferrule mating direction of the optical ferrule, and the     second alignment feature is located at a substantially different     second location along the ferrule mating direction, such that when     the optical ferrule is mated with the mating optical ferrule along     the ferrule mating direction, the first and second alignment     features substantially simultaneously engage the corresponding     alignment features of the mating optical ferrule.     Embodiment 162 is the optical ferrule of embodiment 161, wherein the     first location is at a front of the optical ferrule and the second     location is at a rear of the optical ferrule.     Embodiment 163 is the optical ferrule of embodiment 137 or 140,     wherein the first alignment feature is adapted to contact a     corresponding first alignment feature of the mating optical ferrule     at a first contact region of the first alignment feature, the second     alignment feature is adapted to contact a corresponding second     alignment feature of the mating optical ferrule at a second contact     region of the second alignment feature, and the first and second     contact regions are offset relative to one another along at least     the length and thickness dimensions of the optical ferrule.     Embodiment 164 is the optical ferrule of embodiment 163, further     comprising at least one light redirecting element for receiving     light along the length dimension of the optical ferrule and     redirecting the received light along the thickness dimension of the     optical ferrule.     Embodiment 165 is the optical ferrule of embodiment 135, wherein     when the optical ferrule is mated with a second optical ferrule of     embodiment 135 along a mating direction, the first and second     alignment features are adapted provide a restoring force along the     mating direction when the optical ferrule and the second optical     ferrule are moved apart along the mating direction.     Embodiment 166 is the optical ferrule of embodiment 138, wherein     when the optical ferrule is mated with a second optical ferrule of     embodiment 138 along a mating direction, the first and second     alignment features are adapted provide a restoring force along the     mating direction when the optical ferrule and the second optical     ferrule are moved apart along the mating direction.     Embodiment 167 is the optical ferrule of embodiment 135 or 138 being     hermaphroditic.     Embodiment 168 is the optical ferrule of embodiment 135 or 138 being     unitary.     Embodiment 169 is a connector comprising a housing and the optical     ferrule of embodiment 135 or 138 disposed at least partially inside     the housing.     Embodiment 170 is an optical ferrule comprising: -   a first alignment feature having a size and a shape; and -   a second alignment feature defining an opening, the second alignment     feature comprising a first compliant feature, the first compliant     feature having a first state and a second state different from the     first state, such that inserting an object having the size and the     shape of the first alignment feature into the opening, changes the     first compliant feature from the first state to the second state,     the optical ferrule adapted to receive and transmit light.     Embodiment 171 is the optical ferrule of embodiment 170, wherein the     first state is an unflexed or uncompressed state and the second     state is a flexed or compressed state.     Embodiment 172 is the optical ferrule of embodiment 170, wherein the     opening is in an unexpanded state when the first compliant feature     is in the first state and the opening is in an expanded state when     the first compliant feature is in the second state.     Embodiment 173 is the optical ferrule of embodiment 170, wherein the     first compliant feature is an elastomeric layer.     Embodiment 174 is the optical ferrule of embodiment 170, wherein the     first compliant feature is a first flexible arm having a first fixed     end attached to a first side of the opening and an opposite first     free end.     Embodiment 175 is the optical ferrule of embodiment 170, wherein the     second alignment feature further comprises a second compliant     feature.     Embodiment 176 is the optical ferrule of embodiment 175, wherein the     first compliant feature is a first elastomeric layer disposed on a     first side of the opening and the second compliant feature is a     second elastomeric layer disposed on a different second side of the     opening.     Embodiment 177 is the optical ferrule of embodiment 175, wherein the     first compliant feature is a first flexible arm having a first fixed     end attached to a first side of the opening and an opposite first     free end, and the second compliant feature is a second flexible arm     having a second fixed end attached to a different second side of the     opening and an opposite second free end.     Embodiment 178 is the optical ferrule of embodiment 170, wherein     when the optical ferrule is mated with a mating optical ferrule, the     optical ferrule is adapted to unmate from the mating optical ferrule     via movement of the optical ferrule relative to the mating optical     ferrule along a first dimension of the optical ferrule; and when the     optical ferrule is mated with the mating ferrule, the optical     ferrule is adapted to unmate from the mating ferrule via movement of     the optical ferrule relative to the mating ferrule along a second     dimension of the optical ferrule orthogonal to the first dimension.     Embodiment 179 is the optical ferrule of embodiment 178, wherein the     first dimension is a length dimension of the optical ferrule and the     second dimension is a thickness dimension of the optical ferrule.     Embodiment 180 is an optical ferrule comprising: -   a first alignment feature defining an opening, the opening having a     size and a shape; and -   a second alignment feature comprising a first compliant feature, the     first compliant feature having a first state and a second state     different from the first state, such that inserting the second     alignment feature into an opening of an object, the opening of the     object having the size and shape of the opening of the first     alignment feature, changes the first compliant feature from the     first state to the second state, the optical ferrule adapted to     receive and transmit light.     Embodiment 181 is the optical ferrule of embodiment 180, wherein the     first state is an unflexed or uncompressed state and the second     state is a flexed or compressed state.     Embodiment 182 is the optical ferrule of embodiment 180, wherein the     second alignment feature is in an uncompressed state when the first     compliant feature is in the first state and the second alignment     feature is in a compressed state when the first compliant feature is     in the second state.     Embodiment 183 is the optical ferrule of embodiment 180, wherein the     first compliant feature is an elastomeric layer.     Embodiment 184 is the optical ferrule of embodiment 180, wherein the     first compliant feature is a first flexible arm having a first fixed     end attached to a first side of a body of the second alignment     feature and an opposite first free end.     Embodiment 185 is the optical ferrule of embodiment 180, wherein the     second alignment feature further comprises a second compliant     feature.     Embodiment 186 is the optical ferrule of embodiment 185, wherein the     first compliant feature is a first elastomeric layer disposed on a     first side of a body of the second alignment feature, and the second     compliant feature is a second elastomeric layer disposed on a     different second side of the body.     Embodiment 187 is the optical ferrule of embodiment 185, wherein the     first compliant feature is a first flexible arm having a first fixed     end attached to a first side of a body of the second alignment     feature and an opposite first free end, and the second compliant     feature is a second flexible arm having a second fixed end attached     to a different second side of the body and an opposite second free     end.     Embodiment 188 is the optical ferrule of embodiment 180, wherein     when the optical ferrule is mated with a mating optical ferrule, the     optical ferrule is adapted to unmate from the mating optical ferrule     via movement of the optical ferrule relative to the mating optical     ferrule along a first dimension of the optical ferrule; and when the     optical ferrule is mated with the mating ferrule, the optical     ferrule is adapted to unmate from the mating ferrule via movement of     the optical ferrule relative to the mating ferrule along a second     dimension of the optical ferrule orthogonal to the first dimension.     Embodiment 189 is the optical ferrule of embodiment 188, wherein the     first dimension is a length dimension of the optical ferrule and the     second dimension is a thickness dimension of the optical ferrule.

Descriptions for elements in figures should be understood to apply equally to corresponding elements in other figures, unless indicated otherwise. Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate and/or equivalent implementations can be substituted for the specific embodiments shown and described without departing from the scope of the present disclosure. This application is intended to cover any adaptations or variations of the specific embodiments discussed herein. Therefore, it is intended that this disclosure be limited only by the claims and the equivalents thereof. 

What is claimed is:
 1. An optical ferrule comprising: a first feature having a size and a shape; and a second feature defining an expandable opening, the expandable opening having an unexpanded state and an expanded state, such that inserting an object having the size and the shape of the first feature into the expandable opening expands the opening from the unexpanded state to the expanded state, the optical ferrule adapted to receive and transmit light, wherein the optical ferrule is hermaphroditic.
 2. The optical ferrule of claim 1, wherein the first and second features are alignment features for engaging corresponding alignment features of a mating optical ferrule.
 3. The optical ferrule of claim 2, wherein the second feature comprises a first compliant feature and a second compliant feature, and wherein the first compliant feature comprises a first flexible arm having a first fixed end attached to a first side of the expandable opening and an opposite first free end, and the second compliant feature comprises a second flexible arm having a second fixed end attached to a second side of the expandable opening, opposite the first side, and an opposite second free end, such that when the expandable opening is in the unexpanded state, the first and second free ends are separated by a first distance and when the expandable opening is in the expanded state, the first and second free ends are separated by a second distance greater than the first distance.
 4. An optical ferrule comprising: a first feature defining an opening, the opening having a size and a shape; and a compressible second feature having an uncompressed state and a compressed state, such that inserting the compressible second feature into an opening of an object, the opening of the object having the size and shape of the opening of the first feature, compresses the second feature from the uncompressed state to the compressed state, the optical ferrule adapted to receive and transmit light, wherein the optical ferrule is hermaphroditic.
 5. The optical ferrule of claim 4, wherein the first feature is located at a first location along a ferrule mating direction of the optical ferrule, and the second feature is located at a substantially different second location along the ferrule mating direction, such that when the optical ferrule is mated with a mating optical ferrule along the ferrule mating direction, the first and second features substantially simultaneously engage corresponding features of the mating optical ferrule.
 6. The optical ferrule of claim 5, wherein the first location is at a front of the optical ferrule and the second location is at a rear of the optical ferrule.
 7. An optical ferrule comprising: a first alignment feature having a size and a shape; and a second alignment feature defining an opening, the second alignment feature comprising a first compliant feature, the first compliant feature having a first state and a second state different from the first state, such that inserting an object having the size and the shape of the first alignment feature into the opening, changes the first compliant feature from the first state to the second state, the optical ferrule adapted to receive and transmit light, wherein the optical ferrule is hermaphroditic.
 8. The optical ferrule of claim 7, wherein the first state is an unflexed or uncompressed state and the second state is a flexed or compressed state.
 9. The optical ferrule of claim 7, wherein the opening is in an unexpanded state when the first compliant feature is in the first state and the opening is in an expanded state when the first compliant feature is in the second state.
 10. The optical ferrule of claim 7, wherein the first compliant feature is an elastomeric layer.
 11. The optical ferrule of claim 7, wherein the first compliant feature is a first flexible arm having a first fixed end attached to a first side of the opening and an opposite first free end. 